2021/11/27 更新

写真a

マツバラ コウジ
松原 幸治
MATSUBARA Koji
所属
教育研究院 自然科学系 生産デザイン工学系列 教授
自然科学研究科 材料生産システム専攻 教授
工学部 工学科 教授
職名
教授
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外部リンク

学位

  • 博士(工学) ( 1996年3月   京都大学 )

  • 修士(工学) ( 1992年3月   京都大学 )

  • 学士(工学) ( 1990年3月   京都大学 )

研究キーワード

  • Heat Transfer Engineering

  • 乱流伝熱、太陽熱利用、高温型蓄熱

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 熱工学

経歴(researchmap)

  • 新潟大学   工学部 機械システム工学科   教授

    2012年4月 - 現在

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  • 新潟大学   工学部 機械システム工学科   准教授

    2001年6月 - 2007年4月

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  • 新潟大学   工学部 機械システム工学科   助教授

    1998年4月 - 2001年5月

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  • 新潟大学   自然科学研究科   助手

    1996年4月 - 1998年3月

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  • Niigata University, Research Associate

    1996年 - 2000年

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経歴

  • 新潟大学   工学部 工学科   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   教授

    2012年4月 - 現在

  • 新潟大学   機械システム工学科   教授

    2012年4月 - 2017年3月

  • 新潟大学   機械システム工学科   准教授

    2004年4月 - 2012年3月

  • 新潟大学   自然科学研究科   助手

    1996年4月 - 1998年3月

学歴

  • 京都大学   工学研究科   機械工学専攻 博士後期課程

    1992年4月 - 1996年3月

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    国名: 日本国

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  • 京都大学

    - 1996年

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  • 京都大学 大学院   工学研究科 機械工学専攻 博士前期課程

    1990年4月 - 1992年3月

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  • 京都大学   工学部   機械工学

    1986年4月 - 1990年3月

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    国名: 日本国

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  • 京都大学

    - 1990年

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所属学協会

委員歴

  • 日本機械学会   Journal of Thermal Science and Technology編集委員  

    2018年4月 - 現在   

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    団体区分:学協会

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  • 日本機械学会   Journal of Fluid Science and Technology編集委員  

    2017年4月 - 現在   

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    団体区分:学協会

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論文

  • Heat transfer analysis of 5kWth circulating fluidized bed reactor for solar gasification using concentrated Xe light radiation 査読

    Selvan Bellan, Nobuyuki Gokon, Koji Matsubara, Hyun Seok Cho, Tatsuya Kodama

    Energy   160   245 - 256   2018年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.energy.2018.06.212

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  • Numerical and experimental study on granular flow and heat transfer characteristics of directly-irradiated fluidized bed reactor for solar gasification 査読

    Selvan Bellan, Nobuyuki Gokon, Koji Matsubara, Hyun Seok Cho, Tatsuya Kodama

    International journal of hydrogen energy   43 ( 34 )   1 - 15   2018年8月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ijhydene.2018.06.033

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  • Conjugate radiation-convection-conduction simulation of volumetric solar receivers with cut-back inlets 査読

    Mitsuho Nakakura, Selvan Bellan, Koji Matsubara, Tatsuya Kodama

    Solar Energy   170   606 - 617   2018年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Ltd  

    This study analyzes the effect of cut-back inlets on the conjugate heat transfer of honeycomb-channel solar receivers. Two-way coupling simulations are reported for a plane-surface inlet, and five kinds of cut-back inlet receivers. The receivers are based on a 1.9-mm × 1.9-mm square cell with a 1.0-mm wall thickness. The cut-back inlet receivers have different amounts of material removed from the walls at the channel inlets. Numerical simulations demonstrate that receivers with a 2.4-mm cut from the channel inlet increased the exit temperature by 20.0 K or more, and decreased the pressure drop relative to the plane-surface receiver. Therefore, the results indicate that the cut-back inlet receiver's thermal, and hydrodynamic performance is better for industrial use than is the plane-surface receiver. This performance is then explained with detailed examinations of the individual heat-transfer processes in the model. These detailed comparisons indicate that the top cuts reduce shadow effects as light irradiates the channel walls, allowing more direct irradiation to reach the wall surface, thus improving the overall performance.

    DOI: 10.1016/j.solener.2018.06.006

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  • Loop thermosiphon thermal collector for waste heat recovery power generation 査読

    Koji Matsubara, Mitsuho Nakakura, Selvan Bellan, Kazuo Maezawa

    Experimental Heat Transfer   31   1 - 18   2018年6月

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  • A CFD-DEM study of hydrodynamics with heat transfer in a gas-solid fluidized bed reactor for solar thermal applications 査読

    Selvan Bellan, Koji Matsubara, Hyun Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   116   377 - 392   2018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)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The particles flow and heat transfer characteristics of a high temperature solar thermochemical fluidized bed reactor have been studied for solar beam-down concentrating systems. A numerical model has been developed by the combined approach of computational fluid dynamics (CFD) and discrete element method (DEM) collisional model since it is an effective approach for studying the gas-solid flow. The discrete ordinate model has been used to solve the radiation heat transfer. An experimental visualization of particles circulation pattern and mixing of two-tower fluidized bed system has been presented. A good agreement has been found between the experimental measurements and numerical predictions. The effect of gas superficial velocity, bed mass and inlet gas temperature on the flow pattern and temperature characteristics of the bed have been investigated. The results showed that the maximum and average temperature of the bed, depends on the top layer position and focal point of the concentrated radiation, decreased when increasing the total mass of the bed. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2017.09.015

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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)   出版者・発行元:Taylor and Francis Ltd.  

    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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  • Buoyancy-opposed volumetric solar receiver with beam-down optics irradiation 査読

    Mitsuho Nakakura, Koji Matsubara, Hyun-Seok Cho, Tatsuya Kodama, Nobuyuki Gokon, Selvan Bellan, Kazuo Yoshida

    Energy   141   2337 - 2350   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)   出版者・発行元:Elsevier Ltd  

    This paper describes a volumetric solar receiver that is vertically integrated with beam-down optics for condensed light irradiation. The heat-transfer performance of a silicon carbide honeycomb receiver was investigated using a 30-kWth solar simulator and numerical simulation. The experiments achieved an air temperature of 840 K at the receiver outlet by varying the operational parameters. Numerical simulations were performed for a vertical honeycomb block with beam-down irradiation and a horizontal honeycomb block with tower-type irradiation to elucidate the effects of buoyancy. Three blocks with different sizes were simulated for a variety of operational parameters. When the block was oriented vertically, the flow and temperature fields remained nearly symmetric in and near the receiver. In contrast, when it was oriented horizontally, the flow and temperature became asymmetric, with the hot spot moving toward the receiver's side wall and the stream in the receiver being reversed. The vertical orientation's robustness to buoyancy effects prevented any reduction in the receiver efficiency or outlet temperature and suppressed the thermal leakage.

    DOI: 10.1016/j.energy.2017.11.147

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  • CFD-DEM investigation of particles circulation pattern of two-tower fluidized bed reactor for beam-down solar concentrating system 査読

    Selvan Bellan, Koji Matsubara, Cho Hyun Cheok, Nobuyuki Gokon, Tatsuya Kodama

    POWDER TECHNOLOGY   319   228 - 237   2017年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    In this study, a numerical model has been developed by the combined approach of computational fluid dynamics (CFD) and discrete element method (DEM) collisional model to study the particle-fluid flow of the fluidized bed reactor for solar beam-down concentrating system. The contact forces between the particles have been calculated by the spring-dashpot model, based on the soft-sphere method. An experimental visualization of particles circulation pattern and mixing of two-tower fluidized bed system has been presented. A good agreement has been found between the experimental measurements and numerical predictions. To investigate the influence of fluid flow rate and particle size on the flow pattern of the reactor, simulations have been performed for various conditions. The results indicate that the large size particles induce three-dimensional effects as they are accumulated at the central axis region. The average bed height of the left tower increased by 23.4% when increasing the flow rate about 70%. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.powtec.2017.06.060

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  • Spatially advancing turbulent flow and heat transfer in a curved channel at friction-velocity-based Reynolds number 550 査読

    Koji Matsubara, Takahiro Miura

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   108   2433 - 2443   2017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)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The flow and heat transfer in a curved channel were numerically analyzed for their spatial advancement under the influence of streamline curvature. The simulation was made for the curved channel of the radius ratio 0.92. The curved channel was provided with the fully developed velocity and thermal profile in a straight channel at the mean velocity Reynolds numbers up to 20,400. The number of grid points was more than 3.00 x 10(8) for the case of the highest Reynolds number. The local Nusselt number indicated that the heat transfer was enhanced on the outer wall of the curved channel and such enhancement was notable over the downstream area of phi >= 80 degrees. This heat transfer enhancement came from the large-scale organized vortex which intensified the lateral convection of the secondary stream and caused high values of the turbulent heat flux. The pre-multiplied spectrum was used to analyze the spatial advancement of the large-scale organized vortex. The spectrum indicated that the large-scale vortex was produced from the initial disturbance in the straight channel and the vortex grew and expanded to nearly the channel full width. It was shown that the advancement of the vortex was almost independent from the Reynolds numbers. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2017.01.012

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  • Numerical Analysis of Fluid Flow and Heat Transfer During Melting Inside a Cylindrical Container for Thermal Energy Storage System 査読

    Selvan Bellan, Cho Hyun Cheok, Nobuyuki Gokon, Koji Matsubara, Tatsuya Kodama

    INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016)   1850   2017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)   出版者・発行元:AMER INST PHYSICS  

    This paper presents a numerical analysis of unconstrained melting of high temperature(>1000K) phase change material (PCM) inside a cylindrical container. Sodium chloride and Silicon carbide have been used as phase change material and shell of the capsule respectively. The control volume discretization approach has been used to solve the conservation equations of mass, momentum and energy. The enthalpy-porosity method has been used to track the solidliquid interface of the PCM during melting process. Transient numerical simulations have been performed in order to study the influence of radius of the capsule and the Stefan number on the heat transfer rate. The simulation results show that the counter-clockwise Buoyancy driven convection over the top part of the solid PCM enhances the melting rate quite faster than the bottom part.

    DOI: 10.1063/1.4984427

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  • Particles Fluidized Bed Receiver/Reactor Tests with Quartz Sand Particles Using a 100-kW(th) Beam-Down Solar Concentrating System at Miyazaki 査読

    Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho, Koji Matsubara, Hiroshi Kaneko, Kazuya Senuma, Sumie Itoh, Shin-nosuke Yokota

    INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016)   1850   2017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)   出版者・発行元:AMER INST PHYSICS  

    A window-type, solar fluidized bed receiver with quartz sand particles was tested by a 100-kWth novel beam-down solar concentrating system at Miyazaki, Japan. A compound parabolic concentrator (CPC) was placed above the quartz window of the receiver to increase the concentration of the solar fluxes from the beam-down solar concentrating system. The solar tests were performed in the middle of December, 2015. The central bed temperature of the receiver was reached around 960-1100 degrees C. It was found that only 20 Ndm(3)/min of air flow rate was enough to create the uniform fluidization of the particles at the given temperature range. It was predicted that if the central bed temperature could have been higher than 1100 degrees C if solar receiver test had conducted in other seasons than winter. The next solar campaign of the receiver test will be carried out in October, 2016.

    DOI: 10.1063/1.4984469

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  • Entrance Region Heat Transfer in a Channel With a Ribbed Wall 査読

    Koji Matsubara, Hiroyuki Ohta, Takahiro Miura

    JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME   138 ( 12 )   1 - 7   2016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)   出版者・発行元:ASME  

    Direct numerical simulation was performed for the heat transfer of airflow in the entrance region of a channel with repeated rib protrusions. The rib-pitch to rib-height ratio (Pi/H) was increased from 2.0 to 16.0 by four steps. The rib-height ratio (H/d) was maintained constant at 0.20. The distribution of heat transfer coefficient numerically simulated agreed with the experiment by Kattchee and Mackewicz (1963, "Effects of Boundary Layer Turbulence Promoters on the Local Film Coefficients of ML-1 Fuel Elements," Nucl. Sci. Eng., 16, pp. 31-38). The enhancement parameter was used to evaluate the heat transfer performance by a ribbed channel. This parameter was defined as the ratio of the mean Nusselt number for the ribbed channel against the smooth channel consuming the same pumping power. The simulation result revealed that the enhancement parameter was maximized for Pi/H = 2 to 4 over the upstream ribs (x/delta < 2) and was remained high for Pi/H = 4, 8, and 16 over the downstream ribs (x/delta > 4). Therefore, the optimal rib pitch was smaller for the upstream ribs, and increased to the developed region. The mechanisms underlying this trend were discussed through observation of the streamlines, mean temperature, turbulence statistics, and instantaneous structures. The turbulence was increased over the ribbed wall for the cases of medium to wide rib pitch (Pi/H = 4, 8, and 16), whereas the turbulence increase appeared only over the upstream ribs (x/delta < 2) for the cases of narrow rib pitch (Pi/H = 2). The excellent performance of the wider rib pitch (Pi/H = 4, 8, and 16) at the downstream ribs (x/delta > 2) was resulted from the turbulence increase activating the turbulent heat transport. Whereas, the superiority by the narrower rib pitch (Pi/H = 2, 4) comes from the turbulence activation, and the renewed thin boundary layer which continues due to the densely allocated ribs.

    DOI: 10.1115/1.4034052

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  • Microfluidic mixing using unsteady electroosmotic vortices produced by a staggered array of electrodes 査読

    Koji Matsubara, Takatsune Narumi

    CHEMICAL ENGINEERING JOURNAL   288   638 - 647   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    This paper proposes the improvement of microfluidic mixture using the unsteady electroosmotic vortices induced by a staggered array of electrodes. The unsteady electroosmotic forces near two walls, having opposite directions near two walls, were shown to drive organized vortices to contribute for the enhanced mixing. Examination was given to the flow field involving unsteady vortices and their role for the particle mixing. Numerical simulation was made to evaluate the particle mixing process and to reveal how the particle mixing occurred under influence of disturbance by unsteady vortices. The Reynolds number was set to 0.005 and 1.0 changing the oscillation frequency and the electric field intensity. Efficiency of particle mixing was evaluated by the variance intensity of particle number fraction. The agreement between the simulation for the steady electroosmotic flow and the existing paper, and the grid convergence vindicated the simulation code presently used. The numerical results for unsteady electroosmotic flow demonstrated that the particle mixing was controlled by the oscillation frequency and the balanced time scales of the flow perturbation and convection was essential to the particle mixing. The particle flow was displayed to discuss the phenomenology related to the particle mixing. This revealed that the intermingling of particles within main and secondary vortices crucial for the mixing process whereas the outside streams exerted by the vortices were not effective on it. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cej.2015.12.013

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  • Thermosiphon loop thermal collector for low-temperature waste heat recovery 査読

    Koji Matsubara, Yusaku Matsudaira, Itaru Kourakata

    APPLIED THERMAL ENGINEERING   92   261 - 270   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)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    This paper describes the thermal collector type loop thermosiphon for low-temperature waste heat recovery. Water is used as the working fluid for heat transport at temperatures 100 degrees C and higher. The loop thermosiphon comprises of a thermal receiver, a condenser, and riser and downcomer tubes. The thermal receiver is made of a cupper plate brazed by meandering heat transfer tube. This receiver collects the thermal radiation from the electric heater at the heat transfer area of 1000 cm(2) (40 cm x 25 cm), and transports the heat by vaporization of water to the condenser having heat transfer area of 62 cm(2). In the no inclination mode, the thermosiphon is upright so that the thermal receiver and the condenser are placed vertically. In this mode, the effective thermal conductivity exceeds 60 kW/(m K) when the thermal receiver temperature was higher than 125 degrees C for the water filling ratio alpha = 30-70%. Although the effective thermal conductivity is deteriorated for the higher filling ratio alpha = 80% and 90%, the effects from the filling ratio are tiny for alpha = 30-70%. The experimental tests were also made for the negatively inclined mode where the inlet and exit ports of the receiver were directed downward and for the positively inclined modes where they were directed upward. The tests revealed that the negative inclination almost halted the heat transport. However, the tests also indicated that the positive inclination showed the performance comparable to the no inclination mode for the cases up to the inclination angle 90 degrees. (C) 2015 Elsevier Ltd. All sights reserved.

    DOI: 10.1016/j.applthermaleng.2015.09.004

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  • Particles Fluidized Bed Receiver/Reactor with a Beam-Down Solar Concentrating Optics: 30-kW(th) Performance Test Using a Big Sun-Simulator 査読

    Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho, Koji Matsubara, Tetsuro Etori, Akane Takeuchi, Shin-nosuke Yokota, Sumie Ito

    SOLARPACES 2015: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS   1734   2016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)   出版者・発行元:AMER INST PHYSICS  

    A novel concept of particles fluidized bed receiver/reactor with a beam-down solar concentrating optics was performed using a 30-kW(th) window type receiver by a big sun-simulator. A fluidized bed of quartz sand particles was created by passing air from the bottom distributor of the receiver, and about 30 kW(th) of high flux visible light from 19 xenon-arc lamps of the sun-simulator was directly irradiated on the top of the fluidized bed in the receiver through a quartz window. The particle bed temperature at the center position of the fluidized bed went up to a temperature range from 1050 to 1200 degrees C by the visible light irradiation with the average heat flux of about 950 kW/m(2), depending on the air flow rate. The output air temperature from the receiver reached 1000 - 1060 degrees C.

    DOI: 10.1063/1.4949206

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  • Transport dissimilarity in turbulent channel flow disturbed by rib protrusion with aspect ratio up to 64 査読

    Koji Matsubara, Takahiro Miura, Hiroyuki Ohta

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   86   113 - 123   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Mechanisms for dissimilarities between momentum and heat transport in a disturbed turbulent channel flow of air were studied through direct numerical simulations. A square rib protrusion with an aspect ratio of up to 64 was used to minimize constraints that the side boundary imposed on the wake and the related heat transfer. Channel walls were heated to maintain isothermal conditions. The frictional Reynolds number was set to either 150 or 300. The maximum number of grid points was 96,993,280. A grid convergence test showed that numerical results were independent of grid resolution. The mean pressure obtained from numerical simulation agreed with existing experimental data. Heat transfer characteristics were evaluated using the spatial mean Nusselt number over the ribbed wall and over rib surfaces. This Nusselt number was compared with that for a smooth channel at the same pumping power; the comparison showed that heat transfer increased by as much as 10%. This increase was caused by the simultaneous increase in heat transfer and reduction in skin friction behind the rib over a wall length of 30 times the rib height. Thus, the dissimilarity between local heat and momentum transport involved improving bulk heat transfer and reducing losses to skin friction. Mechanisms leading to the transport dissimilarity were studied via instantaneous structures, turbulence statistics, and spectral analyses. The results suggest that spanwise vortices shed from the rib contributed to the transport dissimilarity. Spanwise vortices entrained fresh fluid into the near-wall region, increasing heat transfer and reducing skin friction simultaneously. This behavior is consistent with reports in the literature obtained by visualization (Yao et al.) and by RANS simulation (Inaoka et al.). The novelty in the present study was that turbulent spanwise vortices and related thermal fields could be reproduced without using a turbulence model. This approach enabled us to know structures of the vortices and the flow three-dimensionality. (C) 2015 Published by Elsevier Ltd.

    DOI: 10.1016/j.ijheatmasstransfer.2015.02.018

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  • Experiments on Thermosyphon Loops for Low-Temperature Waste-Heat Recovery 査読

    Koji Matsubara, Suguru Tachikawa, Itaru Kourakata, Yusaku Matsudaira

    JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS   6 ( 4 )   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)   出版者・発行元:ASME  

    We tested a thermosyphon loop with water as the working fluid using heating rates between 100W and 400W. Four kinds of core blocks were installed in the evaporator and tested: a hollow block, and blocks with narrow holes: Phi 2.2 mm x 90; Phi 2.5mm x 55; and Phi 4.0 mm x 30. The temperature distribution indicated stable flow circulation inside the thermosyphon at low volume ratios but was unstable when the volume ratio was increased higher than 30%. The characteristics of the flow pattern are summarized as a flow map showing the heating rate versus the volume ratio. The recovered heat and the thermal resistance of the thermosyphon loop were clearly improved by using the core blocks with narrow holes instead of hollow blocks for the treated volume ratios from 20% to 80%. The thermal resistance increased when the volume ratio reached high values, suggesting that the effects from the abnormality of the flow circulation affected thermal resistance. The velocity of the gas stream in the thermosyphon was estimated by assuming an isothermal state, and it is diagrammed showing the heating rate at different temperatures. The current experiment of the thermosyphon loop is plotted in this diagram, which indicates the need for a wide margin due to the limitations of the sonic velocity and the pressure head at the full height of the heat pipe.

    DOI: 10.1115/1.4027417

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  • Relaxation of Spatially Advancing Coherent Structures in a Turbulent Curved Channel Flow 査読

    Koji Matsubara, Tomoya Ohishi, Keisuke Shida, Takahiro Miura

    JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME   135 ( 9 )   1 - 9   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME  

    A direct numerical simulation is made for the incompressible turbulent flow in the 180 deg curved channel with a long straight portion connected to its exit port. An examination is made for how the organized coherent vortex grows and decays in the curved channel: the radius ratio of 0.92, the aspect ratio of 7.2, and the succeeding straight section length of 75 times the channel half width. The 1552 x 91 x 128 (-18,427,136) grids are allocated to the computational domain. The frictional-velocity-based Reynolds number is kept at 150 to resolve the long domain including curved and straight regions. In contrast to that the coherent vortex grows along the concave wall, the vortex remains strong in the convex-wall side after the curvature accompanying a tail of the small-scale turbulence near the convex wall. The dissimilarity between the onset and disappearing of the coherent vortex essentially comes from the mean pressure gradient, which aids or averts the near-wall fluid oppositely between the curvature inlet and the exit. The mean flow is decelerated near the inlet of the convex wall to destabilize the flow and to trigger the onset of the coherent vortex. Contrary, the mean flow is accelerated near the exit of the convex wall to weaken the coherent vortex, and is decelerated near the exit of the concave wall to enhance the turbulence. Therefore, the turbulence enhancement and attenuation occurs oppositely between the inlet and exit of the curvature, and the coherent vortex draws a wake in the convex-side rather than the concave-side where it starts.

    DOI: 10.1115/1.4024591

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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

    JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME   134 ( 4 )   1 - 18   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)   出版者・発行元:ASME-AMER SOC MECHANICAL ENG  

    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]

    DOI: 10.1115/1.4005077

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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

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   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)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    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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  • STATISTICAL ANALYSIS OF MEAN APPARENT DIAMETER OF CARBON BLACK AGGREGATES 査読

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

    COMBUSTION SCIENCE AND TECHNOLOGY   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)   出版者・発行元:TAYLOR & FRANCIS INC  

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

    Takahiro Miura, Koji Matsubara, Atsushi Sakurai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   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)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jtst.7.120

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  • Turbojet engine for Aerial Cargo Robot (ACR) 査読

    Kakuya Iwata, Koji Matsubara, Kazumasa Kawasaki, Osamu Matsumoto

    Journal of Robotics and Mechatronics   24 ( 6 )   1040 - 1045   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Fuji Technology Press  

    Turbine engines have been used as high reliable, safe engines in airline transportation. Safety is the most important factor in the social use of aerial robots. We started research on Aerial Cargo Robots (ACR) in 2004. The first flight of an ACR prototype was successfully achieved on November 22, 2005. The ACR prototype consists of a flexible airfoil, twin micro-turbo-jet engines and a gravity center control unit. The ACR meets the following requirements for safety: touchable, i.e., without propellers or rotors
    a low sink rate the same as a parachute, i.e., below 1.0 m/sec
    a low stall speed, i.e., less than 30 km/h
    and a redundancy arrangement control system. The most important safety specification is the use of a silent turbojet engine for the ACR thruster. This paper reports the results of turbojet engine development for aerial robots.

    DOI: 10.20965/jrm.2012.p1040

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  • Spatially advancing coherent structures in curved channel turbulent flow 査読

    Koji Matsubara, Atsushi Sakurai, Kenya Yamazaki, Makoto Takeda

    PHYSICS OF FLUIDS   23 ( 6 )   1 - 12   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)   出版者・発行元:AMER INST PHYSICS  

    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]

    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 査読

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

    NUMERICAL HEAT TRANSFER PART A-APPLICATIONS   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)   出版者・発行元:TAYLOR & FRANCIS INC  

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

    Atsushi Sakurai, Ryo Kanbayashi, Koji Matsubara, Shigenao Maruyama

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   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)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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

    DIRECT AND LARGE-EDDY SIMULATION VIII   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)   出版者・発行元:SPRINGER  

    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

    JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME   132 ( 2 )   1 - 7   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)   出版者・発行元:ASME-AMER SOC MECHANICAL ENG  

    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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  • 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

    NUMERICAL HEAT TRANSFER PART A-APPLICATIONS   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)   出版者・発行元:TAYLOR & FRANCIS INC  

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

    Takahiro Miura, Koji Matsubara, Atsushi Sakurai

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   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)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

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

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

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   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)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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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  • Research for Air Cooling System Using Vacuum-Cooled Water Refrigerant 査読

    Akira Sugawara, Satoru Nakamikawa, Masaya Kageyama, Satoshi Yamazaki, Naoto Abe, Kazumasa Kawasaki, Koji Matsubara

    Journal of Environment and Engineering   3 ( 1 )   135 - 145   2008年

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  • Thermal modeling of Photomask precision baking system 査読

    Koji Matsubara, Mutsuo Kobayashi, Simon Rack, Shinsuke Miyazaki, Toshiya Ikeda

    PHOTOMASK TECHNOLOGY 2006, PTS 1 AND 2   6349   2006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)   出版者・発行元:SPIE-INT SOC OPTICAL ENGINEERING  

    Baking processes are widely acknowledged as being crucial steps in Photomask manufacture, and in particular, the Post-Exposure Bake (PEB) is regarded as the most critical. For 45nm-node Photomasks, and subsequent technology generations, the performance requirements for baking systems significantly exceed those of currently-available equipment. In comparison with Silicon Wafers, Photomask substrates, (typically 6inch square quartz), exhibit markedly different thermal properties. These differences conspire to make Photomask precision baking far more difficult than is the case for wafers.
    Multi-zone heating systems have been developed, and in principle offer a practical tuning method allowing better surface temperature uniformity of Photomasks during critical bake steps to be achieved. The best of these systems compensate, to some extent, for multiple causes of temperature non-uniformity within the baking system. Generally however, the root causes of temperature non-uniformity in the baking process have not all been identified, still less eliminated, and thus there remains a limit to the degree of control of Photomask surface temperature which can be achieved.
    In this study, we devised a "Thermal model" of the Photomask baking process. This model has enabled us to identify root causes of non-uniformity of Photomask surface temperatures, as well as providing a quantitative way of assessing how Photomask baking systems may be improved. We present simulation results from the model, as well as actual test data measured by sensor array plate.

    DOI: 10.1117/12.685497

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  • A study on spanwise heat transfer in a turbulent channel flow - eduction of coherent structures by a conditional sampling technique

    K Matsubara, M Kobayashi, T Sakai, H Suto

    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW   22 ( 3 )   213 - 219   2001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)   出版者・発行元:ELSEVIER SCIENCE INC  

    Coherent structures of temperature fields in the near-wall turbulence (y(+) < 60) were educed by a conditional sampling technique from the DNS data. Treated situation is the fully developed turbulent channel flow for two kinds of temperature fields: (a) the uniform heat Aux assigned on two walls of the channel (UHF) and (b) the constant spanwise mean temperature gradient imposed on the flow over the whole channel width (STG). Following conclusions are obtained. (1) Flow and temperature fields around the quasi-streamwise vortex are roughly uniform in the streamwise direction. (2) Temperature distribution in/around the vortex for UHF and that for STG are similar in shape with azimuthal phase difference of about 90<degrees>. (3) Mechanisms for destruction of turbulent heat flux are similar between UHF case and STG case. (C) 2001 Elsevier Science Inc. All rights reserved.

    DOI: 10.1016/S0142-727X(01)00082-0

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  • The Effects of Duct Inclination Angle on Laminar Mixed Convective Flows over a Backward-Facing Step 査読

    Hiroshi Iwai, Kazuyoshi Nakabe, Kenjiro Suzuki, Koji Matsubara

    International Journal of Heat and Mass Transfer   43   473 - 485   1999年

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  • Prediction of the Turbulent Taylor-Vortex Flow between Concentric Rotating Cylinders

    Mutsuo Kobayashi, Koji Matsubara, Hiroshi Maekawa

    International Journal of Transport Phenomena   1   245 - 254   1999年

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  • Direct Numerical Simulation of a Turbulent Flow with a Linear Spanwise Mean Temperature Gradient (Effects of Prandtl number)

    Koji Matsubara, Mutsuo Kobayashi, Hiroshi Maekawa

    International Journal of Heat and Mass Transfer   41 ( 22 )   3627 - 3634   1998年

▶ 全件表示

MISC

  • ホローコーンノズルによる水噴霧の実験と数値シミュレーション

    渡邉 晃, 備前 瑞貴, 松原 幸治, 松平 雄策

    北陸信越支部総会・講演会 講演論文集   2018 ( 0 )   2018年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

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  • 小型ジェットエンジンの制御実験

    清水 純平, 平元 和彦, 松原 幸治, 小式澤 広之, 桂田 崇史

    北陸信越支部総会・講演会 講演論文集   2018 ( 0 )   2018年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    <p>We report control system design and control experiment of a compact jet engine fueled by an injector. Firstly, the jet engine is operated by a manual control of the fuel flow rate. Based on the knowledge obtained in the manual control experiment, the automatic control system of the jet engine is synthesized. The control law is a gain scheduled PI control that covers the total process of the engine operation, i.e., from the startup to the steady state. The PI control law is scheduled with sensor data of the exhaust gas temperature and the turbine shaft rotation speed.</p>

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  • マイクロガスタービン用アニュラ型燃焼器の可視化と数値解析

    八幡 和典, 松原 幸治, 松平 雄策, 小式澤 広之, 阿部 和幸

    日本ガスタービン学会定期講演会講演論文集   45   135 - 140   2017年10月

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    記述言語:日本語   出版者・発行元:日本ガスタービン学会  

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  • チャネル内乱流伝熱の3次元性に関する研究(条件付きサンプル法による組織構造の抽出)

    松原 幸治, 小林 睦夫, 坂井 隆浩, 須藤 仁

    日本機械学会論文集B編   66 ( 645 )   1414 - 1421   2000年

  • The effect of turbulent velocity fluctuation on thermal sensation

    K Sugai, K Sano, M Kobayashi, K Matsubara, T Takano, T Komoriya, H Maekawa

    SEN-I GAKKAISHI   55 ( 3 )   143 - 148   1999年3月

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    記述言語:日本語   出版者・発行元:SOC FIBER SCIENCE TECHNOLOGY  

    Subjects' right palms were alternately exposed to a turbulent flow of air at 20 degrees C and to a laminar flow of air whose temperature changed gradually, to investigate the effect of turbulent velocity fluctuation on thermal sensation. It was quantitatively shown for the first time, by measuring subjective sensations, that the turbulent velocity fluctuation has the effect of causing the air temperature to feel lower than that of the laminar flow under the lower air temperature condition than skin temperature. The results of heat transfer measurement tests with aluminum circular disks simulating the palm suggested that the difference in thermal sensation for the two air flows was ascribable to the difference in the heat transfer coefficient from the skin of the palm caused by the turbulent velocity fluctuation. The hypothesis that the temperatures of the two air flows would be felt the same when heat flux from the skin in turbulent and laminar air flows were equal, was supported by the results of these experiments.

    DOI: 10.2115/fiber.55.3_143

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  • Direct Numerical Simulation of a Turbulent Channel Flow with a Linear Spanwise Nonuniformity of Time-Mean Temperature(Examination of the Turbulent Statistics)

    Heat Transfer Asian Research   28 ( 8 )   675   1999年

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  • 気流乱れの温冷感覚に及ぼす影響

    菅井 清美, 佐野 浩一, 小林 睦夫, 松原 幸治, 高野 剛, 小森谷 崇, 前川 博

    繊維学会誌   55 ( 3 )   143 - 148   1999年

  • Heat Transfer Performance of a Plate-Finned Tube Heat Exchanger(A Three-Dimensional Steady Numerical Analysis for a Two-Row Plate-Finned Tube)

    Hajime ONISHI, Kyoji INAOKA, Koji MATSUBARA, Kenjiro SUZUKI

    Transactions of the Japan Society of Mechanical Engineers   65 ( 634 )   2077 - 2084   1999年

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  • プレートフィレ付き管熱交換器ユニットの流動・伝熱総合特性(二列管に対する三次元定常数値解析)

    大西 元, 稲岡 恭二, 松原 幸治, 鈴木 健二郎

    日本機械学会論文集B編 日本機械学会   65 ( 634 )   2077 - 2084   1999年

  • 後ろ向きステップ共存対流の三次元熱流動に対する傾斜角の影響

    岩井 裕, 松原 幸治, 中部 主敬, 鈴木 健二郎

    日本機械学会論文集B編 日本機械学会   64 ( 622 )   1809 - 1816   1998年

  • プレートフィン付き管熱交換器ユニットの流動・伝熱総合特性(単列管に対する三次元定常数値解析)

    大西元, 稲岡恭二, 松原幸治, 中部主敬, 鈴木健二郎

    日本機械学会論文集B編   64 ( 618 )   534 - 541   1998年

  • Experimental Study on a Turbulent Boundary Layer with a Constant Temperature Gradient for a Spanwise Direction

    Mutsuo KOBAYASHI, Koji MATSUBARA, Satoshi OHKI, Hiroshi MAEKAWA

    Transactions of the Japan Society of Mechanical Engineers   64 ( 625 )   2971 - 2976   1998年

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  • スパン方向に一定温度こう配を有する平板乱流境界層に関する実験的研究

    小林 睦夫, 松原 幸治, 大木 聡, 前川 博

    日本機械学会論文集B編   64 ( 625 )   2971 - 2976   1998年

  • The effects of inclination angles on mixed convective backward-Facing step flow and heat transfer

    Hiroshi Iwai, Koji Matsubara, Kazuyoshi Nakabe, Kenjiro Suzuki

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   64 ( 622 )   1809 - 1816   1998年

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    Three-dimensional numerical simulations were carried out for mixed convective flows over a backward-facing step in a rectangular duct. Reynolds number, expansion ratio and aspect ratio were kept constant at Re=125, ER=2 and AR=16, respectively. Heat flux at the wall downstream of the step was kept uniform, while other walls were kept at adiabatic condition. Effect of the inclination angles, ft, ft, was the main objective in this study. It was found that when θ1 was varied, the effect of buoyancy became prominent at θ1 = 0°, 180°, while the effect was relatively small for the two horizontal cases(θ1 = 90°, 270°). However, there was still small difference between θ1 = 90° and 270° in the region immediately after the step where the flow was relatively slow. When ft was varied, flow and thermal fields could no longer be considered as two dimensional, except when θ1=-90°, 90°. The maximum Nusselt Number, which appears symmetrically near the side walls in pure forced convection cases, was obtained at only one location close to the lower side wall.

    DOI: 10.1299/kikaib.64.1809

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  • Heat Conduction through a Periodically Varying Thermal-Resistance Thim Layer Between Two Conductors

    Mutsuo KOBAYASHI, Koji MATSUBARA, Hiroshi MAEKAWA, Toyoyuki OGAWA

    Transactions of the Japan Society of Mechanical Engineers   64 ( 627 )   3801 - 3807   1998年

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  • 薄い周期変動熱抵抗層を挟む導体間の熱伝導

    小林 睦夫, 松原 幸治, 前川 博, 小川 豊之

    日本機械学会論文集B編   64 ( 627 )   3801 - 3807   1998年

  • Heat Transfer Performance of a Plate-Finned Tube Heat Exchenger(A Three-Dimensional Steady Numerical Analysis for a Single Row Tube in Low Reynolds Number Range)

    Transactions of the Japan Society of Mechanical Engineers   64 ( 618 )   534 - 541   1998年

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  • Direct Numerical Simulation of a Turbulent Channel Flow with a Spanwise Temperature Gradient(Examination on the Turbulence Statistics)

    Transactions of the Japan Society of Mechanical Engineers Ser. B   64 ( 619 )   856 - 863   1998年

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  • スパン方向の温度勾配を有する平行平板間乱流の直接数値シミュレーション(乱流統計量に関する検討)

    松原 幸治, 小林 睦夫, 前川 博, 鈴木 健二郎

    日本機械学会論文集B編   64 ( 619 )   856 - 863   1998年

  • 後ろ向きステップ鉛直上昇共存対流の熱流動解析

    岩井 裕, 松原 幸治, 中部 主敬, 鈴木 健二郎

    日本機械学会論文集B編   63 ( 612 )   2817 - 2824   1997年

  • Combined Convection Heat Transfer in a Channel with Two Ribs Attached to One Wall

    Koji MATSUBARA, Kazuyoshi NAKABE, Kenjiro SUZUKI, Mutsuo KOBAYASHI, Hiroshi MAEKAWA

    Transactions of the Japan Society of Mechanical Engineers   63 ( 614 )   3362 - 3369   1997年

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  • リブ付き平行平板間流れの共存対流熱伝達

    松原 幸治, 中部 主敬, 鈴木 健二郎, 小林 睦夫, 前川 博

    日本機械学会論文集B編   63 ( 614 )   3362 - 3369   1997年

  • Numerical Simulation of Bnoyancy Assisting Backward-Facing Step Flow and Heat Transfer in a Rectamgular Duct

    Hiroshi IWAI, Koji MATSUBARA, Kazuyoshi NAKABE, Kenjiro SUZUKI

    Transactions of the Japan Society of Mechanical Engineers   63 ( 612 )   2817 - 2824   1997年

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  • リブ付き平行平板間流れの線形安定性解析

    松原 幸治, 中部 主敬, 鈴木 健二郎

    日本機械学会論文集(B編)   62 ( 599 )   2782 - 2789   1996年

  • Flow and Heat Transter in a Clannel with Fims Attached to One Wall

    Koji MATSUBARA, Kazuyoshi NAKABE, Kenjiro SUZUKI

    Transactions of the Japan Society of Mechanical Engineers   62 ( 602 )   3675 - 3682   1996年

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  • フィン付き平行平板間流れの流動および伝熱特性

    松原 幸治, 中部 主敬, 鈴木 健二郎

    日本機械学会論文集(B編)   62 ( 602 )   3675 - 3682   1996年

  • Numerical Simulation of Combined Convection Heat Transfer from Heated Cylinder Mounted in Flow between Parallel Plates

    Kazuyoshi NAKABE, Hiroshi HASEGAWA, Koji MATSUBARA, Kenjiro SUZUKI

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B   62 ( 597 )   1937 - 1944   1996年

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  • 平行平板間流れに挿入した円柱の共存対流熱伝達に関する数値解析

    中部 主敬, 長谷川 寛, 松原 幸治, 鈴木 健二郎

    日本機械学会論文集(B編)   62 ( 597 )   1937 - 1944   1996年

  • Liner Stability Analysis for Channel Flow with Two Ribs Attached to One Wall

    Koji MATSUBARA, Kazuyoshi NAKABE, Kenjiro SUZUKI

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B   62 ( 599 )   2782 - 2789   1996年

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  • Unsteady Flow and Heat Transfer in a Channel with Two Ribs Attached to One Wall

    Proceedings of the loth International Conference, (]G0006[)   73   1994年

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産業財産権

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受賞

  • フェロー

    2015年4月   日本機械学会  

    松原 幸治

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  • ベストプレゼンテーション賞

    2010年8月   日本工学教育協会  

    松原 幸治

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  • 研究奨励賞

    2004年5月   日本伝熱学会北陸信越支部  

    松原 幸治

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共同研究・競争的資金等の研究

  • 高効率太陽熱発電のための高温型粒子流動層式ソーラー集熱/蓄熱システムの開発

    2013年4月 - 2016年3月

    日本学術振興会  科学研究費 基盤研究(B) 

    松原 幸治

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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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  • 米国技術者の創造的活動への予測と意思決定の口述記録と創造教育論の新展開

    2013年4月 - 2015年3月

    日本学術振興会  科学研究費 挑戦的萌芽研究 

    松原 幸治

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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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  • 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 基盤研究(B) 

    松原 幸治

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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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  • 熱輸送を伴う固体・流体ニ相乱流のDNSと確率的数理モデル構築

    2010年4月 - 2013年3月

    日本学術振興会  科学研究費 基盤研究(C) 

    松原 幸治

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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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  • Numerical Computation on Heat Transfer

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    資金種別:競争的資金

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