2021/11/27 更新

写真a

サクライ アツシ
櫻井 篤
SAKURAI Atsushi
所属
教育研究院 自然科学系 生産デザイン工学系列 准教授
自然科学研究科 材料生産システム専攻 准教授
工学部 工学科 准教授
職名
准教授
外部リンク

学位

  • 博士(工学) ( 2007年3月   東北大学 )

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 熱工学

  • ナノテク・材料 / 光工学、光量子科学

経歴(researchmap)

  • 新潟大学   研究推進機構   研究教授(兼務)

    2019年10月 - 現在

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  • JST   さきがけ   研究員

    2019年9月 - 現在

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  • 国立研究開発法人物質・材料研究機構   情報統合型物質・材料研究拠点   特別研究員(兼務)

    2017年4月 - 2020年3月

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  • ジョージア工科大学   工学部機械工学科   客員研究員

    2013年4月 - 2014年3月

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  • 新潟大学   工学部工学科機械システム工学プログラム   准教授

    2013年1月 - 現在

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  • 新潟大学   工学部機械システム工学科   助教

    2008年6月 - 2012年12月

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経歴

  • 新潟大学   研究推進機構   研究教授

    2019年11月 - 現在

  • 新潟大学   工学部 工学科   准教授

    2017年4月 - 現在

  • 新潟大学   自然科学研究科 材料生産システム専攻   准教授

    2013年1月 - 現在

  • 新潟大学   自然科学研究科 材料生産システム専攻   准教授

    2013年1月 - 現在

  • 新潟大学   機能開発工学   准教授

    2013年1月 - 2017年3月

  • 新潟大学   機能開発工学   助教

    2008年6月 - 2012年12月

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学歴

  • 東北大学   大学院工学研究科   機械システムデザイン工学専攻 博士課程 修了

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    国名: 日本国

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  • 東北大学   工学部   機械知能工学科 卒業

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    国名: 日本国

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所属学協会

委員歴

  • 日本熱物性学会   評議員  

    2021年10月 - 2023年10月   

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  • 日本伝熱学会北陸信越支部   県幹事  

    2021年5月 - 2023年5月   

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  • 東京大学大学院工学研究科   博士論文審査委員  

    2020年10月 - 2021年3月   

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  • ATPC2022 The 13th Asian Thermophysical Properties Conference   National Executive Committee  

    2020年8月 - 2022年9月   

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  • 11th SOLARIS2021   Executive Committee  

    2019年9月 - 2021年9月   

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  • 2nd ACTS - Asian Conference on Thermal Sciences 2020   Executive Committee  

    2019年4月 - 2021年10月   

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  • 日本伝熱学会   広報委員会幹事  

    2017年5月 - 2018年5月   

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    団体区分:学協会

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  • 日本機械学会   熱工学部門JTST委員会幹事  

    2017年4月 - 2020年3月   

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    団体区分:学協会

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  • 文部科学省   科学技術政策動向/科学技術予測 専門調査員  

    2017年4月 - 2020年3月   

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    団体区分:政府

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  • 日本伝熱学会   学生会委員会幹事  

    2016年6月 - 2018年5月   

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    団体区分:学協会

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  • 日本伝熱学会   広報委員会  

    2016年6月 - 2018年5月   

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    団体区分:学協会

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  • 日本機械学会   Associate Editor, Journal of Thermal Science and Technology  

    2016年4月 - 2020年3月   

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    団体区分:学協会

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  • 日本伝熱学会   協議員  

    2015年6月 - 2018年5月   

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    団体区分:学協会

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  • 芝浦工業大学   博士論文審査委員  

    2015年4月 - 2016年3月   

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  • 日本伝熱学会   表彰選考委員会幹事  

    2014年6月 - 2015年5月   

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    団体区分:学協会

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  • 日本伝熱学会   学生会委員  

    2010年3月 - 2020年3月   

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    団体区分:学協会

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  • 日本機械学会   北陸信越支部商議員  

    2009年4月 - 2010年3月   

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    団体区分:学協会

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論文

  • Theoretical and Numerical Analysis of Active Switching for Narrow-Band Thermal Emission with Graphene Ribbon Metasurface 査読

    Kyohei Yada, Takashi Shimojo, Hideyuki Okada, Atsushi Sakurai

    Sensors   21 ( 20 )   6738 - 6738   2021年10月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/s21206738

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  • 機械学習を用いた超狭帯域熱ふく射メタマテリアルの開発 招待 査読

    櫻井 篤

    日本機械学会誌 特集 機械学習×熱・流体工学の最先端   14 - 17   2021年7月

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    担当区分:筆頭著者, 責任著者  

    櫻井 篤

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  • 機械学習を用いた熱ふく射制御に関する研究 招待 査読

    櫻井篤

    日本燃焼学会誌 特集―機械学習技術の燃焼分野への応用   63 ( 203 )   60 - 64   2021年3月

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    担当区分:筆頭著者, 責任著者  

    櫻井篤

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  • Active thermal radiation control with nanoslit graphene metasurface 査読

    Kyohei Yada, Atsushi Sakurai

    Journal of Quantitative Spectroscopy and Radiative Transfer   260   107450 - 107450   2021年2月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    Kyohei Yada;Atsushi Sakurai
    We propose a wavelength-selective emitter using nanoslit graphene metasurface. The nanoslit graphene metasurface consists of a graphene sheet, metallic slit, and dielectric layer for tailoring radiative properties. The utilization of rigorous electromagnetic simulation clarifies the mechanisms of thermal radiation. The proposed emitter shows high emissivity and a broad peak wavelength shift because of the electromagnetic resonances of graphene. This study may facilitate the initial design of wavelength-selective emitters using graphene metasurfaces.

    DOI: 10.1016/j.jqsrt.2020.107450

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  • Three-dimensional coupled photon and bioheat transport simulation for laser induced photothermal therapy

    Takuma Kogawa, Yousuke Nakamura, Soma Taniguchi, Hisashi Nakajima, Junnosuke Okajima, Atsuki Komiya, Shigenao Maruyama, Atsushi Sakurai

    Heat Transfer Research   52 ( 5 )   45 - 62   2021年

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    Takuma Kogawa;Yousuke Nakamura;Soma Taniguchi;Hisashi Nakajima;Junnosuke Okajima;Atsuki Komiya;Shigenao Maruyama;Atsushi Sakurai
    Recently, selective heating techniques by laser therapy have been proposed. Among them, laser therapy adopting metallic nanoparticles has garnered attention. By injecting metallic nanoparticles inside a tissue, high absorption can be achieved by the local surface plasmonic resonance at the surface of the nanoparticle. In particular, gold nanorods exhibit significantly high resonance against laser and their effectiveness has been investigated experimentally. However, the modeling of laser therapy by gold nanorods is limited, and a quantitative numerical simulation is required to further investigate the possibility of effective heating by gold nanorods. To investigate the effectiveness of selective heating by laser therapy with gold nanorods, a three-dimensional calculation of laser therapy is performed in this study. To model the thermal conduction and propagation of laser inside a tissue, the Pennes bio-heat transfer equation is applied. The radiative heat transfer is calculated using the radiation element method. The dispersion effect of gold nanorod injection is considered. Comparing the thermal damage between gold nanorod injection and noninjection cases, the performance of selective heating by gold nanorods is evaluated. Furthermore, the effect of gold nanorod injection location on the thermal damage is discussed. Numerical calculation results indicate that gold nanorod injection enables selective heating against the target as well as noninvasive heating on the tissue surface. Furthermore, the heating depth can be controlled by changing the injection location appropriately.

    DOI: 10.1615/heattransres.2021036835

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  • Ultranarrow-Band Wavelength-Selective Thermal Emission with Aperiodic Multilayered Metamaterials Designed by Bayesian Optimization 査読 国際誌

    Atsushi Sakurai, Kyohei Yada, Tetsushi Simomura, Shenghong Ju, Makoto Kashiwagi, Hideyuki Okada, Tadaaki Nagao, Koji Tsuda, Junichiro Shiomi

    ACS Central Science   5 ( 2 )   319 - 326   2019年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Kyohei Yada;Tetsushi Simomura;Shenghong Ju;Makoto Kashiwagi;Hideyuki Okada;Tadaaki Nagao;Koji Tsuda;Junichiro Shiomi
    We computationally designed an ultranarrow-band wavelength-selective thermal radiator via a materials informatics method alternating between Bayesian optimization and thermal electromagnetic field calculation. For a given target infrared wavelength, the optimal structure was efficiently identified from over 8 billion candidates of multilayers consisting of multiple components (Si, Ge, and SiO2). The resulting optimized structure is an aperiodic multilayered metamaterial exhibiting high and sharp emissivity with a Q-factor of 273. The designed metamaterials were then fabricated, and reasonable experimental realization of the optimal performance was achieved with a Q-factor of 188, which is significantly higher than those of structures empirically designed and fabricated in the past. This is the first demonstration of the experimental realization of metamaterials designed by Bayesian optimization. The results facilitate the machine-learning-based design of metamaterials and advance our understanding of the narrow-band thermal emission mechanism of aperiodic multilayered metamaterials.

    DOI: 10.1021/acscentsci.8b00802

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  • Design and fabrication of a wavelength-selective near-infrared metasurface emitter for a thermophotovoltaic system 査読

    A. Sakurai, Y. Matsuno

    Micromachines   10   157   2019年1月

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    A. Sakurai;Y. Matsuno
    In this study, a tungsten-SiO2-based metal–insulator–metal-structured metasurface for the thermal emitter of the thermophotovoltaic system was designed and fabricated. The proposed emitter was fabricated by applying the photolithography method. The fabricated emitter has high emissivity in the visible to near-infrared region and shows excellent wavelength selectivity. This spectral emissivity tendency agreed well with the result calculated by the finite-difference time-domain method. Additionally, the underlying mechanism of its emission was scrutinized. Study of the fabrication process and theoretical mechanisms of the emission, clarified in this research, will be fundamental to design the wavelength-selective thermal emitter.

    DOI: 10.3390/mi10020157

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  • Effects of concentration of participating media on turbulent natural convection in cubic cavity 査読

    Takuma Kogawa, Lin Chen, Junnosuke Okajima, Atsushi Sakurai, Atsuki Komiya, Shigenao Maruyama

    Applied Thermal Engineering   131 ( 25 )   141 - 149   2018年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Takuma Kogawa;Lin Chen;Junnosuke Okajima;Atsushi Sakurai;Atsuki Komiya;Shigenao Maruyama
    To use and understand the large-scale natural convection in the building and systems, heat transfer analysis of the natural convection with radiation is important. The radiation effect is influenced by concentration of the participating media in the considered system. In this study, an effects of concentration of participating media on turbulent natural convection inside a cubic cavity were investigated. The turbulence effect was modeled by large eddy simulation. Further, the radiative heat transfer was calculated by the radiation element method using the ray emission model. In addition, the gas radiation was modeled by the full-spectrum k-distribution method. By varying the partial pressures of H2O and CO2, the effect of the participating media were evaluated. From the calculation, gas radiation effects affected the flow instability and restrained the temperature stratification when the concentration of the participating media was higher. However, the convective heat transfer have not been affected by the significant flow instability by the radiation effects.

    DOI: 10.1016/j.applthermaleng.2017.11.135

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  • Radiation effects on turbulent natural convection in optically thick participating fluids using direct numerical simulation 査読

    Atsushi Sakurai, Ryo Kanbayashi, Koji Matsubara

    Numerical Heat Transfer; Part A: Applications   72 ( 12 )   904 - 920   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Ryo Kanbayashi;Koji Matsubara
    We performed a direct numerical simulation (DNS) of the turbulent natural convection between two parallel plates at a Rayleigh number of Ra = 8.0 × 106, focusing on the turbulent natural convection affected by radiation in an optically thick fluid (τ ≥ 10). When the effects of the radiation were considered, the flow structure and temperature distribution in the channel changed as the optical thickness of the fluid increased. The effects of the radiation on the turbulent natural convection were clearly explained by the turbulence statistics from the DNS results.

    DOI: 10.1080/10407782.2017.1412713

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  • Perfect infrared absorber and emitter based on a large-area metasurface 査読

    Yuki Matsuno, Atsushi Sakurai

    OPTICAL MATERIALS EXPRESS   7 ( 2 )   618 - 626   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Yuki Matsuno;Atsushi Sakurai
    Metasurfaces with metal-insulator-metal structures have attracted significant attention because of their high optical performance. Their spectral emissivity/absorptivity can be modulated with geometrically controlled electromagnetic resonances. However, practical fabrication of these materials in the meter scale remains a challenge. In the present study, an aluminum-and ceria-based metasurface that exhibits nearly perfect emission/absorption in the infrared region was designed. Furthermore, we succeeded in fabricating the proposed metasurface in the meter scale via photolithography and wet etching. This study enhances understanding of underlying resonance mechanisms with electromagnetic simulations and equivalent circuit model, and will facilitate the experimental design of high-efficiency largearea metasurfaces. (C) 2017 Optical Society of America

    DOI: 10.1364/OME.7.000618

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  • Electromagnetic resonances of wavelength-selective solar absorbers with film-coupled fishnet gratings 査読

    Yuki Matsuno, Atsushi Sakurai

    OPTICS COMMUNICATIONS   385   118 - 123   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Yuki Matsuno;Atsushi Sakurai
    The purpose of this study is to clarify the optical characteristics of a Tungsten SiO2-based film-couple metamaterial with a fishnet-shaped grating, and we aim to show that this structure could potentially be used a solar selective absorber for a solar thermophotovoltaic system. The proposed film-coupled metamateris absorber combined with a fishnet-shaped grating shows significant enhancement in its absorption in the spectral region compared with a flat Tungsten surface, and it keeps its spectral emission low in the infrare region, thereby reducing radiative heat loss. The underlying mechanisms of the proposed absorber are discusse through a 3D full-wave electromagnetic simulation, the results of which are compared with that of theoretic equations. Furthermore, its spectral absorption under oblique incident light at the transverse magnetic am transverse electric waves is scrutinized. The underlying absorption mechanisms and relations between eac optical resonance are discussed in this paper and will prove to be fundamental not only in the design of selective absorbers but also in other wavelength-selective thermal radiation controlling devices.

    DOI: 10.1016/j.optcom.2016.10.044

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  • Influence of radiation effect on turbulent natural convection in cubic cavity at normal temperature atmospheric gas 査読

    Takuma Kogawa, Junnosuke Okajima, Astushi Sakurai, Atsuki Komiya, Shigenao Maruyama

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   104   456 - 466   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Takuma Kogawa;Junnosuke Okajima;Astushi Sakurai;Atsuki Komiya;Shigenao Maruyama
    The turbulence structure, boundary layer, and heat transfer of turbulent natural convection, including radiation effects inside the cubic cavity, were investigated in this study. Large eddy simulation was conducted, and Vreman model was adopted for the dynamic subgrid-scale model. To calculate the radiative heat flux efficiently, a coupled calculation method, using the radiation element method by ray emission model, was constructed. To separate the radiation effects of the gas and surface radiations, four calculation conditions have been analyzed; non-radiation, gas radiation, surface radiation, and combined radiation. Observing the vortices structure using the Q value revealed that the surface radiation effect was more dominant for the flow instability than the gas radiation effect. An evaluation of the boundary layers for both the gas and surface radiation effects showed that the flow circulation inside the cubic cavity was enhanced. The surface radiation was dominant in the generation of the shear stress by the turbulent flow. The total heat transfer, which includes the convective and radiative heat transfers, have been investigated. The surface radiation affected on the radiative heat transfer significantly as compared to the gas radiation. The radiation effects changed the radiative heat transfers, while the convective heat transfers of all the calculation conditions were similar. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2016.08.059

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  • Electromagnetic resonances of solar-selective absorbers with nanoparticle arrays embedded in a dielectric layer 査読

    Atsushi Sakurai, Tomoaki Kawamata

    JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER   184   353 - 359   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Tomoaki Kawamata
    We numerically investigate a solar-selective absorber with tungsten core-shell nano particle arrays embedded in an SiO2 layer. The 3D full-wave finite-difference time-domain (FDTD) simulations are performed to investigate the geometric effects of different types of solar-selective absorbers. Consequently, broadband light absorption was achieved with either a tungsten nanoparticle array or a tungsten core-shell nanoparticle array because of the strong electric field enhancement in the gap between the core nanoparticles. The solar performance of the proposed structure is shown for high-efficiency solar light absorption. This study enhances understanding of the light absorption mechanism of metallic nanoparticle/dielectric composite and facilitates the design of high-efficiency solar-selective absorbers. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jqsrt.2016.08.005

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  • Polarization Dependence of the Reflectance and Transmittance of Anisotropic Metamaterials 査読

    Bo Zhao, Atsushi Sakurai, Zhuomin M. Zhang

    JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER   30 ( 1 )   240 - 246   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Bo Zhao;Atsushi Sakurai;Zhuomin M. Zhang
    Due to the interference effect, the reflectance and transmittance of an arbitrary linearly polarized wave cannot be fully described by the reflectance and transmittance of transverse electric and transverse magnetic waves. In this work, the polarization dependence of reflectance and transmittance for anisotropic metamaterials is examined. The explicit mathematical relationship between the Fresnel coefficients and the reflectance (or transmittance) for a given polarization angle is derived. A method is presented that can be used to obtain the reflectance (or transmittance) for any polarization angle from three other polarizations. Several different anisotropic metamaterials are numerically investigated with the finite-difference time-domain technique to elucidate the polarization dependence of reflectance or transmittance. The reflectance and transmittance obtained from the three-polarization-angle method are in agreement with those from the rigorous numerical simulation.

    DOI: 10.2514/1.T4587

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  • Effect of polarization on dual-band infrared metamaterial emitters or absorbers 査読

    Atsushi Sakurai, Bo Zhao, Zhuomin M. Zhang

    JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER   158   111 - 118   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Bo Zhao;Zhuomin M. Zhang
    This work deals with the spectral radiative properties of metamaterials made of a 2D metallic pattern on a dielectric thin film that separates the top periodic structure from a metal ground plane. Two distinct patterns are considered: one consists of disconnected double-rectangle gold pattern and the other is made of L-shape pattern. Both structures exhibit dual-band emission or absorption peaks in the infrared region. Unlike the disconnected rectangular pattern for which the normal emittance is independent of the polarization angle, the L-shape structure shows strong polarization dependent due to near-field coupling. The electromagnetic fields at the resonant frequencies are analyzed using the finite-difference time-domain technique to elucidate the physical mechanisms accounting for the different behaviors. For both structures, the resonance mechanisms can be explained by magnetic polaritons. Inductor-capacitor circuit models are developed to quantitatively predict the resonance frequencies. This work helps the understanding of polarization dependence in metamaterials and may facilitate their applications in biosensing and infrared spectroscopic system. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jqsrt.2014.11.018

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  • Numerical Modeling of a Two-tower Type Fluidized Receiver for High Temperature Solar Concentration by a Beam-down Reflector System 査読

    K. Matsubara, H. Sakai, Y. Kazuma, A. Sakurai, T. Kodama, N. Gokon, H.S. Cho, K. Yoshida

    69   487 - 496   2015年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    K. Matsubara;H. Sakai;Y. Kazuma;A. Sakurai;T. Kodama;N. Gokon;H.S. Cho;K. Yoshida
    This study describes the flow and thermal field of a two-tower fluidized receiver, aimed to be incorporated into a beam-down reflector system. An experimental visualization and numerical simulation were made to accumulate phenomenological knowledge, in order to complete the design of a demonstration model. Visualization of the cold particle bed with no irradiation revealed that global circulation occurs between the two towers by the aeration with different line velocities. The numerical simulation revealed that this global circulation enhances the transport of sensible heat from the irradiated layer in the high pressure tower to the low pressure tower. The global circulation in the two-tower fluidized receiver has the potential to be extended for use in a thermal receiver and direct storage system. Unexpectedly, local circulations occur on the high and low pressure sides, and are stronger than the global circulation. These local circulations contribute to the thermal mixing in each tower. The bottom distributor on the low pressure side can cause an uprising flow which leads to the local circulation. The design of the distributor is suggested to be elaborated based on these findings. (C) 2015 The Authors. Published by Elsevier Ltd.

    DOI: 10.1016/j.egypro.2015.03.057

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  • Laboratory experiment and simulation of higherature fluidized bed air receiver for concentrated solar power generation 査読

    Koji Matsubara, Yuki Kazuma, Atsushi Sakurai, Tatsuya Kodama, Nobuyuki Gokon, Hyun-Seok Cho, Kazuo Yoshida, Yoshinori Nagase

    94 ( 11 )   1323 - 1329   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Koji Matsubara;Yuki Kazuma;Atsushi Sakurai;Tatsuya Kodama;Nobuyuki Gokon;Hyun-Seok Cho;Kazuo Yoshida;Yoshinori Nagase
    This study proposes a t wo-tower t ype fluidized receiver for receiving concentrated s olar light at high temperatures is proposed. This fluidized receiver is coupled with the Miyazaki beam-down reflector system. The visualization and the numerical simulation was made for the laboratory model to show the fluid-dynamics and the heat transport as well as to elaborate the existing demonstration model. The experimental visualization of the cold model demonstrated that in each tower, the particles are moved by the aerated organized flow. The numerical simulation was made using the thermal input cited from the 5.0kWth sun simulator. The numerical simulation demonstrated that the inner particles are heated above 950 °C after 3.0 minutes of the aeration start time. The increase in temperature is caused by the intrusion of the heated particles from the high-pressure side tower to the low-pressure side tower. It is thus suggested that collective circulation occurs between high- and low-pressure side towers and this can be utilized for a direct thermal storage system.

    DOI: 10.3775/jie.94.1323

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  • Resonant frequency and bandwidth of metamaterial emitters and absorbers predicted by an RLC circuit model 査読

    Atsushi Sakurai, Bo Zhao, Zhuomin M. Zhang

    149 ( 149 )   33 - 40   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Bo Zhao;Zhuomin M. Zhang
    Metamaterial thermal emitters and absorbers have been widely studied for different geometric patterns by exciting a variety of electromagnetic resonances. A resistor-inductor-capacitor (RLC) circuit model is developed to describe the magnetic resonances (i.e. magnetic polaritons) inside the structures. The RLC circuit model allows the prediction of not only the resonance frequency, but also the full width at half maximum and quality factor for various geometric patterns. The parameters predicted by the RLC model are compared with the finite-difference time-domain simulation. The magnetic field distribution and the power dissipation density profile are also used to justify the RLC circuit model. The geometric effects on the resonance characteristics are elucidated in the wire (or strip), cross, and square patterned metamaterial in the infrared region. This study will facilitate the design of metamaterial absorbers and emitters based on magnetic polaritons. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jqsrt.2014.07.024

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  • Computational design for a wide-angle cermet-based solar selective absorber for high temperature applications

    Atsushi Sakurai, Hiroya Tanikawa, Makoto Yamada

    132   80 - 89   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Hiroya Tanikawa;Makoto Yamada
    The purpose of this study is to computationally design a wide-angle cermet-based solar selective absorber for high temperature applications by using a characteristic matrix method and a genetic algorithm. The present study investigates a solar selective absorber with tungsten-silica (W-SiO2) cermet. Multilayer structures of 1, 2, 3, and 4 layers and a wide range of metal volume fractions are optimized. The predicted radiative properties show good solar performance, i.e., thermal emittances, especially beyond 2 mu m, are quite low, in contrast, solar absorptance levels are successfully high with wide angular range, so that solar photons are effectively absorbed and infrared radiative heat loss can be decreased. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jqsrt.2013.03.004

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  • Special Issue on Micro- and Nano-Scale Radiative Transfer Preface

    Zhuomin Zhang, Shigenao Maruyama, Atsushi Sakurai, M. Pinar Menguc

    132   1 - 2   2014年1月

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    記述言語:英語   掲載種別:研究論文(研究会,シンポジウム資料等)  

    Zhuomin Zhang;Shigenao Maruyama;Atsushi Sakurai;M. Pinar Menguc

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  • High-temperature Fluidized Receiver for Concentrated Solar Radiation by a Beam-down Reflector System 査読

    K. Matsubara, Y. Kazuma, A. Sakurai, S. Suzuki, L. Soon-Jae, T. Kodama, N. Gokon, C. Hyun Seok, K. Yoshida

    49   447 - 456   2014年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    K. Matsubara;Y. Kazuma;A. Sakurai;S. Suzuki;L. Soon-Jae;T. Kodama;N. Gokon;C. Hyun Seok;K. Yoshida
    This study proposes a novel fluidized receiver for absorbing concentrated solar light at high temperatures. Previously, a tubular receiver and a volumetric receiver were developed to make high-temperature air for a solar gas turbine system. The aim was to combine these elements with a tower reflector; however, it was challenging to install these heavy receivers on the top of the tower. Currently, a fluidized receiver prototype is tested by a 3 kWh solar simulator in preparation for a field test at the Miyazaki beam-down reflector system. The fluid dynamics of the prototype receiver is numerically investigated. The currently treated receiver is an inner-circulating fluidized bed spouted by concentric gas streams with high and low velocities in the center and outer annulus, respectively. The draft tube is submerged in the particles to organize particle circulation. Concentrated light irradiates the particles through a quartz window at the top of the receiver container. Such a fluidized bed was first adopted by Kodama et al. for thermochemical reactions; however, it is currently pursued for its potential as a high-temperature receiver aimed at concentrated solar power generation. Experiments of the prototype receiver (inner diameter = 45 mm) demonstrated that the inner particles are heated to a temperature greater than 900 degrees C and that an increase of the central gas velocity removes the excess temperature near the particle bed surface. A numerical computation suggests that the large-scale circulation of particles leads to the activation of thermal mixing. The currently proposed receiver is thus expected to attenuate re-radiation losses likely to occur in a conventional volumetric porous receiver. The scale-up of the receiver is being considered by the numerical computation for a field test in the Miyazaki 100 kWh beam-down reflector system. (C) 2013 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license

    DOI: 10.1016/j.egypro.2014.03.048

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  • Prediction of the Resonance Condition of Metamaterial Emitters and Absorbers Using LC Circuit Model 査読

    Atsushi Sakurai, Bo Zhao, Zhuomin M. Zhang

    2014年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Atsushi Sakurai;Bo Zhao;Zhuomin M. Zhang

    DOI: 10.1615/ihtc15.rad.009012

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  • Radiation effects on mixed turbulent natural and forced convection in a horizontal channel using direct numerical simulation 査読

    Atsushi Sakurai, Koji Matsubara, Kenji Takakuwa, Ryo Kanbayashi

    55 ( 9-10 )   2539 - 2548   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Koji Matsubara;Kenji Takakuwa;Ryo Kanbayashi
    The purpose of this study is to clarify the radiation effects on mixed turbulent convection in a horizontal channel. The present study provides turbulence statistics using direct numerical simulation (DNS) in an optically thin medium. When the radiation effect is considered, the flow structure and the temperature distribution in the channel change with an increase in the optical thickness of the fluid. The radiation effect changes the distributions of the temperature fluctuation intensity and the turbulent heat flux. These radiation effects on mixed convection can be clearly explained by the turbulence statistics obtained from the DNS results. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2012.01.006

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  • Spanwise Heat Transport in Turbulent Channel Flow With Prandtl Numbers Ranging From 0.025 to 5.0 査読

    Koji Matsubara, Atsushi Sakurai, Takahiro Miura, Takuya Kawabata

    134 ( 4 )   041704 - 8pages   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Koji Matsubara;Atsushi Sakurai;Takahiro Miura;Takuya Kawabata
    The near-wall turbulent heat transport of the three orthogonal directions was directly solved for the Prandtl numbers ranging from 0.025 to 5.0 to validate the algebraic models of the turbulent heat flux. Two kinds of thermal situations were considered in the low Reynolds number turbulent flow: (a) the case with a uniform heat flux in the spanwise direction (UHF) and (b) the case with the mean spanwise temperature gradient (STG). Among the turbulent heat flux models tested, the model of Rogers preferably predicted over the treated range of the Prandtl numbers, but it failed to reproduce the low Prandtl number effects very accurately. This paper revealed that the coefficient of the Rotta model can be modified to include the low Prandtl number effects by means of the correlation between the exact coefficient suggested by DNS and the Prandtl number. [DOI: 10.1115/1.4005077]

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  • STATISTICAL ANALYSIS OF MEAN APPARENT DIAMETER OF CARBON BLACK AGGREGATES

    Koji Matsubara, Katsuya Nishiwaki, Okiteru Fukuda, Togo Yamaguchi, Atsushi Sakurai

    184 ( 9 )   1330 - 1342   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Koji Matsubara;Katsuya Nishiwaki;Okiteru Fukuda;Togo Yamaguchi;Atsushi Sakurai
    A newly developed electric furnace was used to pyrolyze benzene, methane, or acetylene diluted by a nonreactive gas, and the carbon aggregates were separated from the hydrogen-rich gases. The temperature was changed up to 2200K for various levels of initial concentration of hydrocarbon and residence time, and how the experimental parameters affected the mean diameter of carbon aggregates was examined. The temperature increase in experiments led to reduction of the mean diameter of the carbon aggregates, whereas increase in the initial concentration of hydrocarbon or the residence time resulted in slightly lifting it. The mean diameter removed of temperature effects correlated well with the initial carbon atom mol concentration of hydrocarbon, N-C, and this parameter was used to develop the experimental equations. This article presents three kinds of experimental equations, and the prediction accuracy was confirmed to be improved when accounting for increasing the experimental parameters.

    DOI: 10.1080/00102202.2012.691582

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  • 空間的に発展するリブ付きチャネル内乱流熱伝達

    三浦貴広, 松原幸治, 櫻井篤

    日本機械学会論文集B編   78 ( 787 )   607 - 617   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Takahiro Miura;Koji Matsubara;Atsushi Sakurai
    Direct numerical simulation was performed for air turbulent flows and heat transfer in a channel with square ribs attached to one wall. The spatially advancing cases and the fully advanced cases were both treated for the bulk Reynolds number of about 4,560. The rib height, H, was kept constant at 0.2 times the channel half-width, whereas the rib pitch was changed from Pi = 2H to 16 H. The heat transfer performance was evaluated using the ratio between the mean Nusselt number of the ribbed case and that of the smooth case requiring the same pumping power. This ratio was maximized at Pi/H = 9 for the fully advanced cases, but at Pi/H = 2 or 4 for the advancing cases. The mechanisms leading to this difference were discussed through turbulence statistics and their visualization. The thin thermal boundary layer in the advancing region was shown to increase heat transfer on the extended surface of Pi/H = 2 and 4, resulting the higher heat transfer performance than the case of sparse ribs. © 2012 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaib.78.607

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  • Turbulent-Heat-Flux and Temperature-Variance Budgets in a Single-Rib Mounting Channel 査読

    Takahiro Miura, Koji Matsubara, Atsushi Sakurai

    7 ( 1 )   120 - 134   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Takahiro Miura;Koji Matsubara;Atsushi Sakurai
    Heat transfer and fluid flow in a single-rib mounting channel were investigated by directly solving Navier-Stokes and energy equations. The flow and thermal fields were considered to be fully developed at the inlet of the channel, and the simulation was made for spatial advancement of turbulent heat transfer. The Reynolds number based on the friction velocity at the inlet and the channel half width was 150. The Prandtl number was 0.71. The budgets for turbulent heat fluxes and temperature variance at various sections were presented and were investigated, which would be useful for testing and developing turbulence models. Near a circular vortex in front of the rib, pressure diffusion terms made an important contribution. Remarkable production terms were generated near a reattachment point. Production and dissipation terms were not dominant in front of and above the rib, and a time scale ratio exceeded 2.0 in the region.

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  • 4-5-2 Na_2CO_3/MgO溶融塩ソーラーレシーバー反応管に関する研究(4-5 太陽熱発電・水素製造3,Session 4 新エネルギー)

    高橋 将吾, 栗田 慎二, 籏町 剛, 櫻井 篤, 郷右近 展之, 児玉 竜也

    日本エネルギー学会大会講演要旨集   21   232 - 233   2012年

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    記述言語:日本語   出版者・発行元:一般社団法人日本エネルギー学会  

    Double-walled reactor tubes with molten-salt thermal storage were developed for solar air receiver to generate electricity and for solar reforming to produce solar fuel. A mixture of Na_2CO_3 and MgO was loaded as a thermal storage medium into the outer annulus of that. Performances of the reactor tubes were studied as an air receiver and as a reformer tube in the present study.

    DOI: 10.20550/jietaikaiyoushi.21.0_232

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  • Spatially advancing coherent structures in curved channel turbulent flow

    Koji Matsubara, Atsushi Sakurai, Kenya Yamazaki, Makoto Takeda

    23 ( 6 )   065102   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Koji Matsubara;Atsushi Sakurai;Kenya Yamazaki;Makoto Takeda
    Direct numerical simulation was performed for the spatially advancing turbulent flow in a two-dimensional curved channel. The fully developed turbulence was introduced into the curved channel through a straight part, and observation was made for how the near-wall turbulence advanced along curved walls. The frictional Reynolds number, Re(tau 0), was fixed at 150, whereas the radius ratio of the curved channel, alpha, was changed at three steps; 0.8, 0.92, and 0.975. Five computational tests were performed, which include simulations with changing the spanwise length of the channel or the grid arrangement. The maximum number of grid points was 43,610,112 (=936 x 91 x 512) used in the case of alpha = 0.92. Numerical results for the curved flow were nearly free from the grid arrangement or the spanwise length of the channel, and changes of the mean velocity qualitatively agreed with the experiment by Kobayashi [Trans. Jpn. Soc. Mech. Eng., Ser. B 57, 4064 (1991)], which both supported credibility of the simulation. The spanwise pre-multiplied power spectrum and the spanwise two-point correlation captured the peaks corresponding to the micro-scale structures near the straight wall, which continuously grew along the concave wall and advanced to exhibit the wave length of organized flows. Therefore, the micro-scale structures such as quasi-stream vortices and the ejection near the outer wall of the straight channel were suggested to trigger the onset of initial seeds of the organized structure, which grew into the large scale vortices expanding almost over the channel width.(C) 2011 American Institute of Physics. [doi: 10.1063/1.3584126]

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  • HEAT TRANSFER CHARACTERISTICS AND REYNOLDS STRESS BUDGET OF SPATIALLY ADVANCING TURBULENT FLOW IN A CURVED CHANNEL

    Koji Matsubara, Takahiro Miura, Atsushi Sakurai, Kenya Yamazaki, Makoto Takeda

    60 ( 3 )   234 - 253   2011年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Koji Matsubara;Takahiro Miura;Atsushi Sakurai;Kenya Yamazaki;Makoto Takeda
    Direct numerical simulation was performed for the spatially advancing turbulent flow and heat transfer in a two-dimensional curved channel equating the radius ratio to 0.92 or 0.8. The frictional Reynolds number was fixed at 150, whereas the Prandtl number was set at 0.71. According to the numerical result, the remarkable enhancement of heat transfer occurred on the outer wall, suggesting the organized vortex activated the heat transfer. The budgets of Reynolds stresses clarified that the onset and growth of the organized flow was assisted by the direct energy transfer from the mean flow.

    DOI: 10.1080/10407782.2011.588562

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  • 曲がりチャネル内乱流熱伝達のパッシブ制御に関する研究

    内田高志, 松原幸治, 三浦貴広, 太刀川卓, 櫻井篤

    日本機械学会論文集B編   77 ( 783 )   2170 - 2180   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    内田高志;松原幸治;三浦貴広;太刀川卓;櫻井篤
    Direct numerical simulation was performed for a spatially advancing turbulent flow and heat transfer in a two-dimensional curved channel. A rib was placed on either an inner-or outer-wall of the straight part nearby curved-channel inlet for controlling the flow and thermal fields. Outer-wall was heated at the constant temperature and inner-wall was cooled similarly. In the simulation, fully developed flow and temperature computed by the straight channel was given to the inlet of curved channel domain. The frictional Reynolds number was assigned at 150, and the Prandtl number was given 0.71. When a rib was attached to the inner-wall, heat transfer in the upstream region of curved channel was enhanced effectively. On the other hand, placing a rib on the outer-wall caused an enhancement of heat transfer in the relatively downstream region of curved part, suggesting active heat transport of the large-scale vortices. Consequently, the inner-rib case affected more greatly on heat transfer than the outer-rib case. Mean velocity vector and power spectrum analysis implied that development of coherent structures near the outer-wall were controlled by a rib. It was found that inner-rib restrained large-scale vortex, while outer-rib promoted growth and power of large-scale vortex. © 2011 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaib.77.2170

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  • Radiative Heat Transfer Analysis in a Turbulent Natural Convection Obtained from Direct Numerical Simulation 査読

    Atsushi Sakurai, Ryo Kanbayashi, Koji Matsubara, Shigenao Maruyama

    6 ( 3 )   449 - 462   2011年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Ryo Kanbayashi;Koji Matsubara;Shigenao Maruyama
    Thermal radiation in a turbulent natural convection plays an important role in a wide area of engineering and nature. The purposes of this study are to investigate the effects of turbulent fluctuation on radiative heat transfer, and to evaluate radiative heat transfer models applied to turbulent natural convection. The present radiative heat transfer analysis of a turbulent natural convection using direct numerical simulation (DNS) provides a useful fundamental data for the complete coupling simulation in the future.

    DOI: 10.1299/jtst.6.449

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  • DNS Study on Control of Turbulent Heat Transfer in Curved Channel 査読

    Takashi Uchida, Koji Matsubara, Takahiro Miura, Atsushi Sakurai

    15   309 - +   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Takashi Uchida;Koji Matsubara;Takahiro Miura;Atsushi Sakurai

    DOI: 10.1007/978-94-007-2482-2_49

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  • An Efficient Method for Radiative Heat Transfer Applied to a Turbulent Channel Flow 査読

    Atsushi Sakurai, Shigenao Maruyama, Koji Matsubara, Takahiro Miura, Masud Behnia

    132 ( 2 )   023507 - (7 pages)   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Shigenao Maruyama;Koji Matsubara;Takahiro Miura;Masud Behnia
    The purpose of this paper is to consider a possibility of the independent column approximation for solving the radiative heat fluxes in a 3D turbulent channel flow. This simulation method is the simplest extension of the plane-parallel radiative heat transfer. The test case of the temperature profile was obtained from the direct numerical simulation. We demonstrate the comparison between the 3D radiative transfer simulation and the independent column approximation with an inhomogeneous temperature field and optical properties. The above mentioned results show the trivial discrepancies between the 3D simulation and the independent column approximation. The required processing time for the independent column approximation is much faster than the 3D radiative transfer simulation due to the simple algorithm. Although the independent column simulation is restricted to simple configurations such as channel flow in this paper, wide application areas are expected due to the computational efficiency.

    DOI: 10.1115/1.4000240

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  • A spatially advancing turbulent flow and heat transfer in a curved channel 招待 査読

    Koji Matsubara, Akihiko Matsui, Takahiro Miura, Atsushi Sakurai, Hitoshi Suto, Koji Kawai

    39 ( 1 )   14 - 26   2010年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Koji Matsubara;Akihiko Matsui;Takahiro Miura;Atsushi Sakurai;Hitoshi Suto;Koji Kawai
    Direct numerical simulation was performed for a spatially advancing turbulent flow and heat transfer in a two-dimensional curved channel, where one wall was heated to a constant temperature and the other wall was cooled to a different constant temperature. In the simulation, fully developed flow and temperature from the straight-channel driver was passed through the inlet of the curved-channel domain. The frictional Reynolds number was assigned 150, and the Prandtl number was given 0.71. Since the flow field was examined in the previous paper, the thermal features are mainly targeted in this paper. The turbulent heat flux showed trends consistent with a growing process of large-scale vortices. In the curved part, the wall-normal component of the turbulent heat flux was twice as large as the counterpart in the straight part, suggesting active heat transport of large-scale vortices. In the inner side of the same section, temperature fluctuation was abnormally large compared with the modest fluctuation of the wall-normal velocity. This was caused by the combined effect of the large-scale motion of the vortices and the wide variation of the mean temperature
    in such a temperature distribution, large-scale ejection of the hot fluid near the outer wall, which is transported into the near inner-wall region, should have a large impact on the thermal boundary layer near the inner wall. Wave number decomposition was conducted for various statistics, which showed that the contribution of the large-scale vortex to the total turbulent heat flux normal to the wall reached roughly 80% inside the channel 135° downstream from the curved-channel inlet. © 2009 Wiley Periodicals, Inc.

    DOI: 10.1002/htj.20275

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  • 高温水蒸気の非灰色ふく射物性に関する各種ガスモデルの評価 査読

    櫻井 篤, 松原幸治

    日本機械学会論文集(B編)   76 ( 771 )   1681 - 1684   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    櫻井 篤;松原幸治
    Radiative Properties of high temperature water vapor play an important role for radiative heat transfer analysis in combustion engineering, fire safety science, etc. Absorption spectrum of visible to infrared light inherently depends on the wavelength of electromagnetic waves. Ignoring the spectral dependence makes radiative heat transfer analyses wrong results. To overcome the problem, various nongray gas models have been proposed. However, there are a few studies for summarizing these characteristics in prediction. The goal of this study is to give valuable information for engineering applications. In the present study, radiative properties and simulation characteristics of high-temperature water vapor using the Planck-mean approximation, the statistical narrow band model, and the full-spectrum k-distribution model are assessed rigorously by comparing with the Line-by-Line method. The recent HITRAN/HITEMP databases are employed to calculate Line-by-Line spectrum.

    DOI: 10.1299/kikaib.76.771_1681

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  • RADIATION ELEMENT METHOD COUPLED WITH THE LATTICE BOLTZMANN METHOD APPLIED TO THE ANALYSIS OF TRANSIENT CONDUCTION AND RADIATION HEAT TRANSFER PROBLEM WITH HEAT GENERATION IN A PARTICIPATING MEDIUM 査読

    Atsushi Sakurai, Subhash C. Mishra, Shigenao Maruyama

    57 ( 5 )   346 - 368   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Subhash C. Mishra;Shigenao Maruyama
    This article deals with the implementation of the radiation element method (REM) with the lattice Boltzmann method (LBM) to solve a combined mode transient conduction-radiation problem. Radiative information computed using the REM is provided to the LBM solver. The planar conducting-radiating participating medium is contained between diffuse gray boundaries, and the system may contain a volumetric heat generation source. Temperature and heat flux distributions in the medium are studied for different values of parameters such as the extinction coefficient, the scattering albedo, the conduction-radiation parameter, the emissivity of the boundaries, and the heat generation rate. To check the accuracy of the results, the problem is also solved using the finite-volume method (FVM) in conjunction with the LBM. In this case, the data for radiation field are calculated using the FVM. The REM has been found to be compatible with the LBM, and in all the cases, results of the LBM-REM and the LBM-FVM have been found to provide an excellent comparison.

    DOI: 10.1080/10407780903583008

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  • Heat Transfer Characteristics and Reynolds Stress Budgets in Single-Rib Mounting Channel 査読

    Takahiro Miura, Koji Matsubara, Atsushi Sakurai

    5 ( 1 )   135 - 150   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Takahiro Miura;Koji Matsubara;Atsushi Sakurai
    Heat transfer and fluid flow in a single-rib mounting channel were investigated by directly solving Navier-Stokes and energy equations. Flow and thermal fields were considered to be fully developed at the inlet of the channel, and the simulation was made for spatial advancement of turbulent heat transfer. Keeping the frictional Reynolds number, Re-tau 0, at 150, the rib height ratio was changed in four steps from H/delta = 0.05 to H/delta = 0.4. Computational results were confirmed to be nearly independent of grid meshes. In addition, numerical accuracy was confirmed through close agreement between computed mean pressure and the experiment by Yao et al. (1995). The numerical results revealed that the highest value of the mean Nusslet number was as large as 1.3 times the smooth surface consuming the same pumping power, and the local enhancement of heat transfer was correlated with the turbulence increase near the rib front and the reattachment point. According to the Reynolds stress budgets for H/delta = 0.2, there were mechanisms to induce powerful fluctuations: (1) Streamwise fluctuation was increased through production by flow deceleration in the upstream of the rib; (2) Redistribution to wall-normal and spanwise fluctuations was fortified by the fluid splattering to the rib front. Therefore, excellent performance of heat transfer was concluded to occur due to flow structures, which induce the strong disturbance near the rib front triggering smooth transition of the separated shear layer.

    DOI: 10.1299/jtst.5.135

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  • The Radiation Element Method Coupled with the Bioheat Transfer Equation Applied to the Analysis of the Photothermal Effect of Tissues 査読

    Atsushi Sakurai, Shigenao Maruyama, Koji Matsubara

    58 ( 8 )   625 - 640   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Shigenao Maruyama;Koji Matsubara
    The purpose of this study is to develop the radiation element method by ray emission method (REM2) code appropriate for coupling with the bioheat transfer equation, and to clarify the photothermal effect of various parameters inside biological tissues. First, the REM2, which involves the air-tissue interface effect, is validated with the existing literature. In order to clarify the effects of optical and thermophysical properties of biological tissues, a one-dimensional tissue model of CW light transport and bioheat transfer is employed. The present study provides nondimensional results, which are obtained by varying refractive index, extinction coefficient, scattering albedo, blood perfusion parameter, and conduction-radiation parameter, show valuable guidance for understanding the coupled light and bioheat transport in tissues.

    DOI: 10.1080/10407782.2010.516698

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  • Optimal number and location of heaters in 2-D radiant enclosures composed of specular and diffuse surfaces using micro-genetic algorithm 査読

    A. Safavinejad, S. H. Mansouri, A. Sakurai, S. Maruyama

    29 ( 5-6 )   1075 - 1085   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A. Safavinejad;S. H. Mansouri;A. Sakurai;S. Maruyama
    In this study, a combinatorial optimization methodology has been presented for determining the optimal number and location of equally powered heaters over some parts of the boundary, called the heater surface, to satisfy the desired heat flux and temperature profiles over the design surface while keeping the total heaters power constant but floating the number of heaters. In a typical enclosure, candidate locations were numerous for placing the heaters. The optimal number and location could be found by checking among all the possible combinations of heater power ranges and locations on the heater surface. The possibility of checking only a small portion of the total search space was increasingly desirable for finding an overall optimal solution. Micro-genetic algorithm was a candidate method which displayed a significant potential in achieving that task. Micro-genetic algorithm was used to minimize an objective function which was expressed by the sum of square errors between estimated and desired heat fluxes on the design surface. Radiation element method by ray emission model (REM(2)) Was used to calculate the radiative heat flux on the design surface. It enabled us to handle the effects of specular surfaces and blockage radiation due to enclosure geometry. The capabilities of this methodology were demonstrated by finding the optimal number and position of heaters in two irregular enclosures. The effects of refractory surface characteristics (i.e., diffuse and/or specular) on the optimal solution have been studied in detail. The results show that the refractory surface characteristics have profound effects on the optimal number and location of heaters. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.applthermaleng.2008.05.025

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  • Coupled Photon and Heat Transport Simulation inside Biological Tissue for Laser Therapy 査読

    Atsushi Sakurai, Isami Nitta, Shigenao Maruyama, Junnosuke Okajima, Koji Matsubara

    4 ( 2 )   314 - 323   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Isami Nitta;Shigenao Maruyama;Junnosuke Okajima;Koji Matsubara
    The objective of this study is to develop a new simulator for laser therapy. In order to minimize undesired effects on the laser therapy, it is important to precisely predict for heat and photon transport inside a biological tissue. In the present study, the photon transport is solved with the Radiation Element Method by Ray Emission Model (REM2), and then coupled with bioheat transfer equation. The dimensionless results become valuable guidance for developing a laser therapy system.

    DOI: 10.1299/jtst.4.314

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  • 空間的に発展する曲がりチャネル内乱流熱伝達 査読

    松原幸治, 松井暁彦, 三浦貴広, 櫻井篤, 須藤仁, 川合考治

    日本機械学会論文集B編   75 ( 754 )   1336 - 1343   2009年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    松原幸治;松井暁彦;三浦貴広;櫻井篤;須藤仁;川合考治
    Direct numerical simulation was performed for a spatially advancing turbulent flow and heat transfer in a two-dimensional curved channel, where one wall was heated at the constant temperature and another wall was cooled similarly. In the simulation, fully developed flow and temperature computed by the straight-channel driver was given to the inlet of curved channel domain. The frictional Reynolds number was assigned 150, and the Prandtl number was given 0.71. Since the flow field was examined in the previous paper, thermal features are mainly targeted in the present paper. Turbulent heat flux showed trends consistent with growing process of large-scale vortices. In the curved part, the wall-normal component of the turbulent heat flux was twice as large as the counterpart in the straight part, suggesting active heat transport of large-scale vortices. In the inner side of the same part, temperature fluctuation was abnormally large when compared with modest fluctuation of wall-normal velocity. This was caused by the combined effect of the large-scale motion of the vortices and the monotonous variation of the mean temperature
    in such a temperature distribution, large-scale ejection of the hot fluid near the outer, which is transported into the near inner-wall region, should made large impact on thermal boundary layer near the inner wall. Wave number decomposition was made for various statistics, and such effort showed that contribution of the large-scale vortex to the total turbulent heat flux normal to the wall was roughly 80 percent at the channel center of 130° downstream from the curved-channel inlet.

    DOI: 10.1299/kikaib.75.754_1336

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  • Three-Dimensional Phonon Transport Simulation for Nano/Micro-Structured Materials 査読

    Atsushi Sakurai, Shigenao Maruyama, Atsuki Komiya, Koji Miyazaki

    International Journal of Nanoscience   7 ( 2-3 )   103 - 112   2008年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Shigenao Maruyama;Atsuki Komiya;Koji Miyazaki

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  • Evaluation method for radiative heat transfer in polydisperse water droplets 査読

    Shigenao Maruyama, Hirotaka Nakai, Atsushi Sakurai, Atsuki Komiya

    109 ( 1 )   1 - 15   2008年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Shigenao Maruyama;Hirotaka Nakai;Atsushi Sakurai;Atsuki Komiya
    Simplifications of the model for nongray radiative heat transfer analysis in participating media comprised of polydisperse water droplets are presented. Databases of the radiative properties for a water droplet over a wide range of wavelengths and diameters are constructed using rigorous Mie theory. The accuracy of the radiative properties obtained from the database interpolation is validated by comparing them with those obtained from the Mie calculations. The radiative properties of polydisperse water droplets are compared with those of monodisperse water droplets with equivalent mean diameters. Nongray radiative heat transfer in the anisotropic scattering fog layer, including direct and diffuse solar irradiations and infrared sky flux, is analyzed using REM2. The radiative heat fluxes within the fog layer containing polydisperse water droplets are compared with those in the layer containing monodisperse water droplets. Through numerical simulation of the radiative heat transfer, polydisperse water droplets can be approximated by using the Sauter diameter, a technique that can be useful in several research fields, such as engineering and atmospheric science. Although this approximation is valid in the case of pure radiative transfer problems, the Sauter diameter is reconfirmed to be the appropriate diameter for approximating problems in radiative heat transfer, although volume-length mean diameter shows better accordance in some cases. The CPU time for nongray radiative heat transfer analysis with a fog model is evaluated. It is proved that the CPU time is decreased by using the databases and the approximation method for polydisperse particulate media. (C) 2007 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jqsrt.2007.05.006

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  • Optimal Boundary Design of Radiant Enclosures Using Micro-Genetic Algorithm (Effects of Refractory Properties and Aspect Ratio of Enclosure on Heaters Setting) 査読

    Ali Safavinejad, Shigenao Maruyama, Seyed Hossein Mansouri, Atsushi Sakurai

    3 ( 2 )   179 - 194   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Ali Safavinejad;Shigenao Maruyama;Seyed Hossein Mansouri;Atsushi Sakurai
    This study presents an optimization methodology for finding the heaters setting that produce a desired heat flux and temperature distribution over a region of the enclosure surface, called the design surface. Radiation element method by ray emission model (REM2) was used to calculate the radiative heat flux on the design surface, which enable us to handle reflecting surfaces. Micro-genetic algorithm was used to minimize an objective function, which was expressed by the sum of square error between estimated and desired heat fluxes on the design surface. The novel features of this methodology were demonstrated by finding the optimal heaters setting of a three dimensional enclosure for three aspect ratio. The effects of refractory properties have been studied as well.

    DOI: 10.1299/jtst.3.179

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  • Discrete ordinates radiation element method for radiative heat transfer in three-dimensional participating media 査読

    Shigenao Maruyama, Atsushi Sakurai, Atsuki Komiya

    51 ( 2 )   121 - 140   2007年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Shigenao Maruyama;Atsushi Sakurai;Atsuki Komiya
    A new algorithm, the discrete ordinates radiation element method (DOREM), for modeling radiative heat transfer in inhomogeneous three-dimensional participating media is described. The DOREM uses advantages of the both the radiation element method (REM) and the discrete ordinates method. Benchmark comparisons are conducted against several radiation models. The DOREM successfully implements radiative heat transfer simulations precisely, since false scattering never occurs. The DOREM has advantages of computational speed against Monte Carlo, and the CPU time and the memory size of the DOREM are 82 times faster and 767 times smaller at the maximum than that of the REM.

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  • The effect of three-dimensional radiative heat transfer in cloud fields using the radiation element method 査読

    A Sakurai, S Maruyama, S Sakai, T Nishikawa

    93 ( 1-3 )   79 - 87   2005年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A Sakurai;S Maruyama;S Sakai;T Nishikawa
    The effects of three-dimensional (3D) radiative heat transfer in cloud fields are investigated by using the radiation element method by ray emission model (REM2). We have performed a 3D radiative heat transfer simulation in two fair-weather cumuli that are subjected to solar and sky irradiation. One of the features in this simulation is that both shortwave radiation and longwave radiation are considered. As a result, the effect of shortwave radiation is not so substantial as compared with that of longwave radiation in terms of the heat generation rate within the cloud. Also, the radiative interaction does not strongly affect the relative differences of the average heat generation rate between the single cloud model and the double cloud model. However, the distributions of heat generation rate at the thin layer beneath the cloud surface are influenced by radiative interaction and shadowing effect. Hence, these effects caused by 3D radiative heat transfer are important for horizontal inhomogeneous cloud fields. (C) 2004 Elsevier Ltd. All rights reserved.

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  • Comparison of radiation element method and discrete ordinates interpolation method applied to three-dimensional radiative heat transfer 査読

    Atsushi Sakurai, Tae-Ho Song, Shigenao Maruyama, Hyun Keol Kim

    48 ( 2 )   259 - 264   2005年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Atsushi Sakurai;Tae-Ho Song;Shigenao Maruyama;Hyun Keol Kim
    This paper compares and scrutinizes the characteristics of radiation element method by ray emission model (REM2) and discrete ordinates interpolation method (DOIM). A three-dimensional radiative heat transfer problem is solved within a rectangular enclosure containing absorbing, emitting, nonscattering medium with temperatures given as a sine function. The calculation results are validated with the zonal results and the analytical solution. Generally, the calculation results agree well with the exact solution. However, when the optically thickness is much larger than unity, the zonal and REM2 results overestimate the heat source strength and wall heat flux, and when it is small, DOIM results underestimate them. The reasons and remedies are carefully discussed.

    DOI: 10.1299/jsmeb.48.259

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▶ 全件表示

書籍等出版物

  • 「マイクロ・ナノ熱工学の進展」 第5章 ふく射の放射 第2節 大面積メタマテリアルによる波長選択宇宙放熱

    櫻井篤

    (株)エヌ・ティー・エス  2021年5月 

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  • 内閣府宇宙開発戦略推進事務局 将来衛星アーキテクチャ等の技術動向等に関する調査 調査報告書 第2編「メタマテリアルの設計手法、開発、実用化状況」

    櫻井篤

    三菱電機株式会社  2021年3月 

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  • 気象研究ノート「気象・気候学のための最新放射計算技術とその応用」第二章3次元大気中の放射伝達

    岩渕弘信, 石田春磨, 櫻井篤( 担当: 共著)

    日本気象学会  2011年12月 

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    記述言語:日本語 著書種別:学術書

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MISC

  • Active Thermal Radiation Control Based on Graphene Metasurface 査読

    Kyohei Yada, Atsushi Sakurai

    Proceedings of The 2nd Pacific Rim Thermal Engineering Conference   24479   2019年12月

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    担当区分:責任著者  

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  • A Spectrally Selective Solar Absorber based on a Double-layered Film

    R. Igarashi, A. Sakurai

    Proceeding of ICFD2019   OS18-89   2019年11月

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  • Active Thermal Radiation Control Based On MIM Metasurface

    H. Hasegawa, M. Araki, H. Kishi, A. Sakurai

    Proceeding of ICFD2019   OS18-40   2019年11月

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  • Wavelength-selective thermal emission with metamaterials 招待

    Atsushi Sakurai

    The 1st Asia-Pacific Thermofluid Science & Engineering Conference   2019年10月

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    担当区分:筆頭著者  

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  • Spectral Control of Thermal Radiation based on Metamaterials 招待

    The 4th A3 Metamaterials Forum 2019   2019年8月

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    担当区分:筆頭著者  

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  • 熱輻射メタマテリアル (Thermal radiation based on metamaterials) 招待

    櫻井 篤

    フォノンエンジニアリング研究グループ第3回研究会   2019年7月

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    担当区分:筆頭著者  

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  • Ultra-Narrowband Wavelength-Selective Thermal Emitter and Absorber with Multi-Layered Metamaterials Designed by Bayesian Optimization

    Atsushi Sakurai

    MRS Spring Meeting 2019   3110426   2019年4月

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    担当区分:筆頭著者  

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  • Controlling thermal radiation spectrum with metamaterials 招待

    Atsushi Sakurai

    China-Japan Heat Transfer Symposium 2019   2019年1月

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    担当区分:筆頭著者  

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  • Three-Dimensional Coupled Photon and Bioheat Transport Simulation for Laser Induced Photothermal Therapy

    S. Taniguchi, Y. Nakamura, T. Kogawa, J. Okajima, A. Komiya, S. Maruyama, A. Sakurai

    Proceedings of the 17th International Symposium on Advanced Fluid Information   172 - 173   2017年11月

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    記述言語:英語  

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  • Coupled Photon and Bioheat Transport Simulation for Laser Induced Plasmonic Photothermal Therapy

    Y. Nakamura, A. Komiya, J. Okajima, S. Maruyama, A. Sakurai

    Proceedings of the 16th International Symposium on Advanced Fluid Information   30 - 31   2016年

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  • Experimental and Numerical Investigations of Local Heating of Biological Tissue for Laser Therapy

    T. Sugiura, T. Okabe, J. Okajima, A. Komiya, Y. Nakamura, A. Sakurai, V. Timochenko, T. Kodama, S. Maruyama

    Proceedings of the 15th International Symposium on Advanced Fluid Information   64 - 65   2015年

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  • Coupled Photon and Bioheat Transport Simulation for Laser Induced Photothermal Therapy

    A. Sakurai, Y. Sato, A. Komiya, J. Okajima, Y. Nakamura, S. Maruyama

    Proceedings of 12th International Conference on Flow Dynamics   372 - 373   2015年

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  • E213 メタマテリアルを用いた波長選択性熱ふく射制御に関する研究

    富樫 駿輔, 櫻井 篤

    熱工学コンファレンス講演論文集   2014   "E213 - 1"-"E213-2"   2014年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    We numerically demonstrate wavelength-selective absorption in core-shell deposited on top of a continuous Au film by excitation of magnetic resonance. The resonance of magnetic polariton at wavelength 653 nm is confirmed by electromagnetic Geld distribution. The influences of Au core diameter, SiO_2 shell thickness on the resonance wavelength are studied with 3D finite-differential time-domain (FDTD) method. The fundamental study will facilitate the development of a core-shell metamaterial for energy and sensing applications.

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  • 0523 <曲がりチャネル内乱流の直接シミュレーション>(OS5-5 壁乱流:統計,構造,動力学の理解,OS5 壁乱流:統計,構造,動力学の理解)

    大石 友也, 松原 幸治, 櫻井 篤

    流体工学部門講演会講演論文集   2013   "0523 - 01"-"0523-02"   2013年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Direct numerical simulation was performed for a spatially advancing turbulent flow in a two-dimensional curved channel. The radius ratio of the curved part, α , was set at 0.92, the same as Kobayashi et al.'s experiment. And the friction Reynolds number, Re_<τ0>, was set at 550. Numerically solved mean velocity field showed trends consistent with the experiment. As a result, the validity of the simulation was confirmed. Instantaneous flow field implied that micro-scale structures near the outer wall were related to the birth and growth of large-scale vortices.

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  • 9-228 課題発見・解決型を目指した設計製図の試行((04)工学教育の個性化・活性化-V/(13)教育評価・自己点検・評価システム-I)

    新田 勇, 櫻井 篤

    工学教育研究講演会講演論文集   25 ( 61 )   508 - 509   2013年8月

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    記述言語:日本語   出版者・発行元:公益社団法人日本工学教育協会  

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  • 1105 小型ジェットエンジンの性能測定と熱力学解析(OS02-2 複合伝熱・物質移動に関する最近の進展,オーガナイズドセッション 2:「複合伝熱・物質移動に関する最近の進展」)

    大森 圭悟, 佐藤 元, 松原 幸治, 櫻井 篤, 松平 雄策, 小式澤 広之, 阿部 和幸

    講演論文集   2013 ( 50 )   110501 - 110502   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 1107 ループ型サーモサイフォンの実験的研究 : 各部熱抵抗の検討(OS02-2 複合伝熱・物質移動に関する最近の進展,オーガナイズドセッション 2:「複合伝熱・物質移動に関する最近の進展」)

    太刀川 卓, 松原 幸治, 櫻井 篤, 小浦方 格, 松平 雄策

    講演論文集   2013 ( 50 )   110701 - 110702   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • Experimental and Numerical Determination of Radiative Properties of CeO2 Packed Bed

    K. Ogino, A. Sakurai, H. Gonome, S. Maruyama

    Proceedings of Tenth International Conference on Flow Dynamics   700 - 701   2013年

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  • H221 ループ型サーモサイフォンの実験的研究(一般講演(6))

    太刀川 卓, 松原 幸治, 櫻井 篤, 小浦方 格, 松平 雄策

    熱工学コンファレンス講演論文集   2012   463 - 464   2012年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    It's necessary to further improve technology of energy-saving with increasing energy consumption. And there is a current situation that low-temperature exhaust heat has been discarded from a factory. So we have started a study of the heat pipe for utilizing this exhaust heat. It's necessary to carry out heat transportation of long distance and high density for utilizing the exhaust heat. Therefore the present study had been used the loop thermosyphon. But quantities of the water which are enclosed in loop thermosyphon will affect heat transportation. So the present study has been practiced the experiment which had been changed quantities of the water and thermal dose. And we have researched the effect of heat transportation. As the result, heat transportation is improved with increasing thermal dose.

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  • G060064 円筒容器内の凍結濃縮に関する実験的研究 : 溶液の凍結に及ぼす温度勾配の影響について

    飯塚 誠也, 松原 幸治, 櫻井 篤, 松平 雄策

    年次大会 : Mechanical Engineering Congress, Japan   2012   "G060064 - 1"-"G060064-3"   2012年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    An experimental study was performed for freeze-concentration of 1 % water-solution of sodium chloride in a cylindrical container, where a heat transfer pipe was set vertically. Experimental results denoted that temperature gradient in the ice promote solute rejection. When the ice is given a temperature gradient for long time , solute is eliminated little by little from the ice . By varying the temperature of the inner wall, the difference of concentration rate, distribution coefficient and concentration of ice was measured.

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  • 0303 固体・流体二相噴流の研究(GS01-2 熱工学・流体工学,オーガナイズドセッション 13:「噴霧及び燃焼現象の解明とその利用技術」)

    太田 智, 松原 幸治, 櫻井 篤

    講演論文集   2012 ( 49 )   30301 - 30302   2012年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 0204 EFガスタービン試験装置の検討(GS01-1 熱工学・流体工学,オーガナイズドセッション 14:「ロボット・メカトロ」)

    田沼 勇人, 松原 幸治, 櫻井 篤, 小浦方 格

    講演論文集   2012 ( 49 )   20401 - 20402   2012年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • Experimentally and Numerically Investigations for Light and Heat Transport inside Biological Tissues

    A. Sakurai, Y. Sato, J. Okajima, A. Komiya, S. Maruyama

    Proceedings of the Twelfth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration   64 - 65   2012年

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  • Evaluation and Analysis of Atmospheric Radiative Energy Transfer

    N. Yamada, J. Okajima, A. Sakurai, A. Komiya, S. Maruyama

    Proceedings of the Twelfth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration   72 - 73   2012年

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  • Analysis of Axisymmetric Radiative Heat Transfer in Biological Tissue using the Radiation Element Method

    S. Maruyama, Y. Sato, A. Sakurai, J. Okajima, M. Baneshi, A. Komiya

    Proceedings of Eighth International Conference on Flow Dynamics   534 - 535   2011年11月

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    記述言語:英語  

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  • C122 空間的に発展する二次元曲がり流路内乱流の組織構造と熱伝達(OS-5:乱流伝熱の実験とCFDの融合(2))

    竹田 真, 松原 幸治, 大石 友也, 三浦 貴広, 櫻井 篤

    熱工学コンファレンス講演論文集   2011   59 - 60   2011年10月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Direct numerical simulation was performed for a spatially advancing turbulent flow in a two-dimensional curved channel. The radius ratio of the curved part, α, was set at 0.92, the same as Kobayashi et al.'s experiment. And the friction Reynolds number, Re_<τ0>, was set at 550 and 300. Numerically solved mean velocity field showed trends consistent with the experiment. As a result, the validity of the simulation was confirmed. Instantaneous flow field implied that micro-scale structures near the outer wall were related to the birth and growth of large-scale vortices.

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  • J056062 曲がりチャネル内乱流熱伝達に及ぼす半径比の影響([J05606]乱流における運動量,熱,物質の輸送現象(6))

    信田 啓介, 松原 幸治, 竹田 真, 櫻井 篤

    年次大会 : Mechanical Engineering Congress, Japan   2011   "J056062 - 1"-"J056062-4"   2011年9月

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    記述言語:英語   出版者・発行元:一般社団法人日本機械学会  

    Direct numerical simulation was performed for a spatially advanced turbulent flow in a two-dimensional curved channel. In the past research, the influence of radius ratio was not discussed. Therefore, the radius ratio of the curved part, a=0.92, the same as Kobayashi et al.'s experiment, and 0.8 were calculated. Then, we carried out simulations of the temperature condition where two walls were sustained at different temperatures. Prandtl number was assumed to be 0.71. Analogy between the friction factor and the Stanton number was confirmed through computed cases. Turbulence statistics including the turbulent heat flux budgets were presented and discussed.

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  • 213 曲がりチャネル乱流の大規模渦制御と伝熱促進に関する研究(OS4-3複合伝熱・物質移動に関する最近の進展)

    内田 高志, 太刀川 卓, 櫻井 篤, 三浦 貴広, 松原 幸治

    講演論文集   2011 ( 48 )   63 - 64   2011年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • ふく射・乱流複合熱輸送シミュレーションモデルの開発

    円山重直, M. Baneshi, 櫻井篤

    次世代融合研究システム(スーパーコンピュータ)利用研究成果報告書   第14   49 - 51   2011年

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  • P-15 教育GP「つもり学習からの脱却」((08)工学教育に関するGood Practice,ポスター発表論文):: 機械系の実施事例

    櫻井 篤, 松原 幸治, 鳴海 敬倫, 坂本 秀一, 岩部 洋育, 渡辺 健彦

    工学・工業教育研究講演会講演論文集   2010 ( 0 )   686 - 687   2010年

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    記述言語:日本語   出版者・発行元:公益社団法人 日本工学教育協会  

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  • The Effects of Radiative Heat Transfer in a Turbulent Channel Flow

    A. Sakurai, K. Takakuwa, K. Matsubara, S. Maruyama

    Proceedings of The Ninth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI 2009   52 - 53   2009年

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  • Energy Transfer Simulation and Analysis on Mega-scale Environment

    N. Yamada, A. Sakurai, A. Komiya, S. Maruyama

    Proceedings of The Ninth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI 2009   56 - 57   2009年

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  • Three-Dimensional Nongray Radiative Heat Transfer In Conjunction With Turbulent Natural Convection Using Dorem And Les

    A. Sakurai, S. Maruyama, M. Behnia, A. Komiya, T. Kawabe

    The Fifth International Symposium on Radiative Transfer, International Centre for Heat and Mass Transfer,   2007年

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  • Conjugate Simulation of Nongray Radiative Heat Transfer and Natural Convection in a Participating Media Using DOREM, REM2, and LES

    A. Sakurai, S. Maruyama, M. Behnia, A. Komiya, S. Sakai

    International Symposium on Turbulence, Heat and Mass Transfer 5,   539 - 542   2006年

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  • Evaluation of 1-D Discrete Ordinates Radiation Element Method for Radiative Heat Transfer in Anisotropic scattering Media

    H. Nakai, S. Maruyama, A. Sakurai, A. Komiya

    Third International Conference on Flow Dynamics   159 ( 160 )   2006年

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  • Micro-Scale Heat Transport Modeling Using Equation of Phonon Radiative Transfer

    A. Sakurai, S. Maruyama, K. Miyazaki, A. Komiya

    Third International Conferene on Flow Dynamics   61 - 62   2006年

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  • Combined Heat Transfer of Convection and Radiation Using LES and REM2

    A. Sakurai, M. Behnia, S. Maruyama, A. Komiya, S. Sakai

    Abstracts of the Second International Conference on Flow Dynamics   3 - 23   2005年

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  • ふく射要素法用いた雲領域における三次元ふく射伝熱の影響

    櫻井篤, 円山重直, 西川徹, 酒井清吾

    2004年度春季大会後援予稿集   331   2004年

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  • The Effect of Three-Dimensional Radiative Heat Transfer in Clouds Field Using The Radiation Element Method

    A. Sakurai, S. Maruyama, S. Sakai, T. Nishikawa

    Radiative Transfer-Ⅳ Proceedings of the Fourth International Symposium on Radiative Transfer   135 - 142   2004年

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講演・口頭発表等

  • Active Thermal Radiation Control Based on Graphene Metasurface

    Kyohei Yada, Atsushi Sakurai

    Proceedings of The 2nd Pacific Rim Thermal Engineering Conference  2019年12月 

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    開催年月日: 2019年12月

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  • Active Thermal Radiation Control Based On MIM Metasurface

    H. Hasegawa, M. Araki, H. Kishi, A. Sakurai

    Proceeding of ICFD2019  2019年11月 

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    開催年月日: 2019年11月

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  • A Spectrally Selective Solar Absorber based on a Double-layered Film

    R. Igarashi, A. Sakurai

    Proceeding of ICFD2019  2019年11月 

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    開催年月日: 2019年11月

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  • Wavelength-selective thermal emission with metamaterials 招待

    Atsushi Sakurai

    The 1st Asia-Pacific Thermofluid Science & Engineering Conference  2019年10月 

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    開催年月日: 2019年10月

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  • Spectral Control of Thermal Radiation based on Metamaterials 招待

    The 4th A3 Metamaterials Forum 2019  2019年8月 

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    開催年月日: 2019年8月

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  • 熱輻射メタマテリアル (Thermal radiation based on metamaterials) 招待

    櫻井 篤

    フォノンエンジニアリング研究グループ第3回研究会  2019年7月 

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    開催年月日: 2019年7月

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  • Ultra-Narrowband Wavelength-Selective Thermal Emitter and Absorber with Multi-Layered Metamaterials Designed by Bayesian Optimization

    Atsushi Sakurai

    MRS Spring Meeting 2019  2019年4月 

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    開催年月日: 2019年4月

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  • Controlling thermal radiation spectrum with metamaterials 招待

    Atsushi Sakurai

    China-Japan Heat Transfer Symposium 2019  2019年1月 

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    開催年月日: 2019年1月

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  • 熱輻射メタマテリアル~波長選択制御の考え方とその産業応用について~ 招待

    櫻井篤

    第10回CSJ化学フェスタ2020  2020年10月 

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  • 半導体発光素子を用いた非平衡熱ふく射に関する基礎的研究

    荒木 昌弥, 南雲 延洋, 松野 優樹, 櫻井 篤

    日本機械学会熱工学コンファレンス2020  2020年10月 

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  • 熱ふく射×機械学習 招待

    櫻井篤

    日本機械学会講習会「機械学習×熱・流体工学の最先端」  2020年9月 

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  • 熱ふく射メタマテリアル ~これまでの研究紹介と将来展望について~ 招待

    櫻井 篤

    日本機械学会熱工学部門オンラインセミナー  2020年5月 

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  • 機械学習を用いた超狭帯域熱放射多層膜の開発 招待

    櫻井 篤

    Nano tech 2020 特別シンポジウム:マテリアルズ・インフォマティクス:「できる」から「できた」へ  2020年1月 

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  • Infrared ray drying by emitting to the absorption band of solvents 招待

    Tsuyoshi Totani, Sakurai Atsushi, Tadaaki Nagao, Kondo Yoshio

    The 1st Asia-Pacific Thermofluid Science & Engineering Conference  2019年10月 

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産業財産権

  • 赤外線ヒーター

    戸谷剛, 櫻井篤, 近藤良夫

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    出願人:北海道大学、新潟大学、日本碍子株式会社

    出願番号:特願2016-207571  出願日:2016年10月

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  • 赤外線ヒーター

    戸谷剛, 櫻井篤, 近藤良夫

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    出願人:北海道大学、新潟大学、日本碍子株式会社

    出願番号:特願2015-175068  出願日:2015年9月

    公開番号:特開2017-050254  公開日:2017年3月

    特許番号/登録番号:特許6692046  登録日:2020年4月 

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  • 狭帯熱放射スペクトルを有する構造体

    塩見淳一郎, 櫻井篤, 津田宏治

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    出願番号:特願2018-087363 

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  • 赤外線放射装置

    戸谷剛, 櫻井篤, 近藤良夫

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    出願番号:特願2018-082171 

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受賞

  • 共同研究の受賞:第40回日本熱物性シンポジウム学生ベストプレゼンテーション賞

    2019年10月   日本熱物性学会   宇宙機用極低温ラジエータ材料に関する研究(2) -多様な金属周期構造による共振波長の広帯域化-

    東浦 真史, 太刀川 純孝, 櫻井篤, 齋藤 智彦

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  • 日本伝熱学会賞「学術賞」

    2018年5月   日本伝熱学会  

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    受賞区分:国内外の国際的学術賞  受賞国:日本国

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  • 講演論文表彰受賞

    2018年3月   日本機械学会熱工学部門  

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  • 新潟大学学長賞

    2017年9月   新潟大学  

    櫻井篤

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    受賞国:日本国

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  • Best Student Paper Award

    2017年3月   指導学生の受賞:The 6th International Symposium on Micro and Nano Technology (ISMNT)  

    Yuki Matsuno, Atsushi Sakurai

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  • 指導学生の受賞:日本機械学会三浦賞

    2017年3月  

    松野優樹

     詳細を見る

  • 日本熱物性学会奨励賞

    2015年10月  

    櫻井篤

     詳細を見る

    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

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  • JQSRT outstanding reviewer award

    2014年8月   Elservier  

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    受賞国:日本国

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  • 日本伝熱学会北陸信越支部賞研究奨励賞

    2014年5月  

    櫻井篤

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

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  • 指導学生の受賞:日本機械学会畠山賞

    2013年3月  

    山田真

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  • 新潟大学工学部教育賞

    2011年3月  

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  • 日本工学教育協会研究講演会ポスター発表賞

    2010年8月   日本工学教育協会  

    櫻井 篤, 松原 幸治, 鳴海 敬倫, 坂本 秀一, 岩部 洋育, 渡辺 健彦

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  • 第43回日本伝熱シンポジウム優秀プレゼンテーション賞

    2006年5月  

    櫻井 篤

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

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  • 大学院工学研究科長賞

    2005年3月   東北大学  

    櫻井篤

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    受賞国:日本国

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  • 日本機械学会第39期東北支部講演会独創研究学生賞

    2004年3月  

    櫻井篤

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

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共同研究・競争的資金等の研究

  • メタサーフェスを用いた極低温用放射デバイスに関する研究

    研究課題/領域番号:20K21049  2020年7月 - 2022年3月

    日本学術振興会  科学研究費助成事業 挑戦的研究(萌芽)  挑戦的研究(萌芽)

    太刀川 純孝, 櫻井 篤

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    配分額:5460000円 ( 直接経費:4200000円 、 間接経費:1260000円 )

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  • 波長選択人工材料の研究

    2019年10月 - 2021年3月

    株式会社村田製作所  共同研究

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  • 遠方場Super Planckian熱ふく射輸送の可能性

    2019年9月 - 2023年3月

    科学技術振興機構  戦略的創造研究推進事業(さきがけ) 

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  • 非周期的メタマテリアルによる熱ふく射スペクトル制御

    2018年4月 - 2021年3月

    日本学術振興会  科学研究費補助金(基盤研究C) 

    櫻井 篤

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    担当区分:研究代表者  資金種別:競争的資金

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  • ミクロ・ナノ熱工学によるがんの早期診断と低侵襲治療

    2016年4月 - 2020年3月

    日本学術振興会  科学研究費補助金(基盤研究B)  基盤研究(B)

    圓山 重直

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    資金種別:競争的資金

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  • Ni系及びW系サーメット光吸収体の設計に関する研究

    2016年4月 - 2017年6月

    京セラ株式会社  受託研究(一般受託研究) 

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:909000円

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  • メタマテリアルによる熱ふく射制御と太陽熱光起電力発電への展開

    2015年4月 - 2018年3月

    日本学術振興会  科学研究費補助金(若手研究B)  若手研究(B)

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

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  • マルチスケール大気放射モデルを用いた全球雲解像放射エネルギー収支の定量化

    2015年4月 - 2018年3月

    日本学術振興会  科学研究費補助金(基盤研究B)  基盤研究(B)

    太田 芳文

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    資金種別:競争的資金

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  • 金属有機化合物分解法による波長選択的吸収膜の創成

    2014年4月 - 2017年3月

    日本学術振興会  科学研究費補助金(挑戦的萌芽)  挑戦的萌芽研究

    宮崎 康次

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    資金種別:競争的資金

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  • 高温太陽集熱による新型ソーラーガス化反応器の開発

    2012年4月 - 2015年3月

    日本学術振興会  科学研究費補助金(基盤研究B)  基盤研究(B)

    郷右近 展之

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    資金種別:競争的資金

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  • 三次元大気放射モデルを用いた全球雲解像放射収支の解明

    2012年4月 - 2015年3月

    日本学術振興会  科学研究費補助金(基盤研究B)  基盤研究(B)

    太田 芳文

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    資金種別:競争的資金

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  • アジア伝統的エネルギー利用地域におけるバイオEFガスタービンの実地試験と導入促進

    2011年4月 - 2014年3月

    日本学術振興会  科学研究費補助金(基盤研究B)  基盤研究(B)

    松原 幸治

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    資金種別:競争的資金

    配分額:600000円 ( 直接経費:600000円 )

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  • 革新的熱流体シミュレーションによるソーラー水素製造の高効率化に関する研究

    2011年4月 - 2013年3月

    日本学術振興会  科学研究費補助金(若手研究B)  若手研究(B)

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:2600000円 ( 直接経費:1820000円 、 間接経費:780000円 )

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  • 大規模並列計算による乱流・ふく射伝熱現象の解明

    2010年4月 - 2011年3月

    民間財団等  山口奨学金 

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:460000円 ( 直接経費:420000円 、 間接経費:40000円 )

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  • 人に優しい光医療工学の実現を目指したレーザー治療シミュレータの開発

    2009年4月 - 2010年3月

    民間財団等  内田エネルギー科学振興財団 

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:300000円 ( 直接経費:270000円 、 間接経費:30000円 )

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  • 環境調和型エネルギーシステムのためのふく射・乱流複合熱輸送シミュレーションモデルの開発

    2008年4月 - 2009年3月

    民間財団等  佐々木環境技術振興財団 

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:1000000円 ( 直接経費:918750円 、 間接経費:81250円 )

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  • 大規模複雑系におけるふく射伝熱現象に関する研究

    2005年4月 - 2008年3月

    日本学術振興会  科学研究費補助金(特別研究員奨励費)  特別研究員推奨費

    櫻井 篤

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:2700000円 ( 直接経費:2700000円 )

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担当経験のある授業科目(researchmap)

  • 創造工学実習

    2008年6月
    -
    2019年3月
    機関名:新潟大学

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  • 環境エネルギー工学

    機関名:新潟大学

     詳細を見る

  • 先進環境エネルギー工学特論

    機関名:新潟大学

     詳細を見る

  • 設計製図I・II

    機関名:新潟大学

     詳細を見る

  • 機械工学実験

    機関名:新潟大学

     詳細を見る

  • リメディアル演習

    機関名:新潟大学

     詳細を見る

  • 熱工学I

    機関名:新潟大学

     詳細を見る

  • 熱工学II

    機関名:新潟大学

     詳細を見る

  • 伝熱工学

    機関名:新潟大学

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担当経験のある授業科目

  • 機械工学実験III

    2020年
    -
    現在
    機関名:新潟大学

  • 伝熱工学

    2020年
    -
    現在
    機関名:新潟大学

  • 機械工学実験IV

    2020年
    -
    現在
    機関名:新潟大学

  • 先端研究入門

    2020年
    -
    現在
    機関名:新潟大学

  • 物理工学実験

    2017年
    -
    現在
    機関名:新潟大学

  • 機械工学概論

    2017年
    -
    現在
    機関名:新潟大学

  • 工学リテラシー入門(力学分野)

    2017年
    -
    現在
    機関名:新潟大学

  • 機械科学総論

    2016年
    -
    現在
    機関名:新潟大学

  • 機械工学演習

    2016年
    -
    現在
    機関名:新潟大学

  • 水素エネルギーシステムデザイン演習・実習Ⅱ

    2015年
    -
    現在
    機関名:新潟大学

  • 熱工学II

    2015年
    -
    現在
    機関名:新潟大学

  • ソーラー水素エネルギー国際会議コミュニケーション

    2015年
    機関名:新潟大学

  • リメディアル演習

    2014年
    -
    現在
    機関名:新潟大学

  • 環境エネルギー工学

    2014年
    -
    現在
    機関名:新潟大学

  • 先進環境エネルギー工学特論

    2014年
    -
    2019年
    機関名:新潟大学

  • リメディアル演習(機械数理)

    2014年
    -
    2016年
    機関名:新潟大学

  • エネルギー変換工学

    2014年
    -
    2015年
    機関名:新潟大学

  • 機械科学セミナーⅠ

    2013年
    -
    2015年
    機関名:新潟大学

  • 材料生産システム特定研究Ⅰ

    2013年
    -
    2015年
    機関名:新潟大学

  • 研究発表演習・発表

    2013年
    -
    2015年
    機関名:新潟大学

  • 機械科学セミナーⅡ

    2013年
    -
    2014年
    機関名:新潟大学

  • 材料生産システム特定研究Ⅱ

    2013年
    -
    2014年
    機関名:新潟大学

  • 機械科学特別演習

    2012年
    -
    2015年
    機関名:新潟大学

  • 機械科学文献詳読Ⅰ

    2012年
    -
    2015年
    機関名:新潟大学

  • 機械科学文献詳読Ⅱ

    2012年
    -
    2015年
    機関名:新潟大学

  • くらしを支える機械システム工学

    2011年
    -
    現在
    機関名:新潟大学

  • 熱工学III

    2010年
    -
    2018年
    機関名:新潟大学

  • 工学リテラシー入門(機械システム工学科)

    2009年
    -
    現在
    機関名:新潟大学

  • 創造工学実習

    2009年
    -
    現在
    機関名:新潟大学

  • 熱工学I

    2009年
    -
    現在
    機関名:新潟大学

  • 設計製図I

    2009年
    -
    2014年
    機関名:新潟大学

  • 設計製図II

    2009年
    -
    2014年
    機関名:新潟大学

  • 英文輪読II

    2008年
    -
    現在
    機関名:新潟大学

  • 機械工学実験II

    2008年
    -
    現在
    機関名:新潟大学

  • 機械工学実験I

    2008年
    -
    現在
    機関名:新潟大学

  • 英文輪読I

    2008年
    -
    現在
    機関名:新潟大学

  • 卒業研究

    2008年
    -
    現在
    機関名:新潟大学

  • 卒業研修

    2008年
    -
    現在
    機関名:新潟大学

▶ 全件表示

教育活動に関する受賞

  • 三浦賞

    2017年3月   日本機械学会  

    受賞者:松野優樹

  • Best Student Paper Award

    2017年3月   The 6th International Symposium on Micro and Nano Technology (ISMNT)  

    受賞者:Yuki Matsuno, Atsushi Sakurai

  • 畠山賞

    2013年3月   日本機械学会  

    受賞者:山田真

  • 新潟大学工学部教育賞

    2011年3月   新潟大学  

  • 日本工学教育協会研究講演会ポスター発表賞

    2010年8月   日本工学教育協会  

    受賞者:櫻井 篤,松原 幸治,鳴海 敬倫,坂本 秀一,岩部 洋育,渡辺 健彦

    教育GP「つもり学習からの脱却」-機械系の実施事例-

その他教育活動及び特記事項

  • 芝浦工業大学博士論文学外審査委員,課程博士2名

    2015年4月 - 2016年3月