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Researchers
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OKUYAMA Kunito
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【Published Thesis】 Passive production of synthesis gas from liquid methanol using a packed bed of porous material particles 2018
【Published Thesis】 Dynamic behavior with rapid evaporation of an inkjet water droplet upon collision with a high-temperature solid above the limit of liquid superheat 2017.09
【Published Thesis】 A Single, straight-tube pulsating heat pipe (Examination of a mechanism for the enhancement of heat transport) 2013.05
Tokyo Institute of Technology Completed
Tokyo Institute of Technology Graduated
Doctor of Engineering - Tokyo Institute of Technology
Duty Yokohama National UniversityFaculty of Engineering Division of Materials Science and Chemical Engineering Professor
Duty Yokohama National UniversityFaculty of Engineering Division of Materials Science and Chemical Engineering Associate Professor
Duty Yokohama National UniversityGraduate school of Engineering Associate Professor
Duty Yokohama National UniversitySchool of Engineering Associate Professor
Duty Yokohama National UniversitySchool of Engineering Lecturer
Researcher
日本機械学会
日本伝熱学会
化学工学会
Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering
Transient Boiling Phenomena and Heat Transfer
Project Year：
Micro-actuators using liquid-vapor phase change
Project Year：
Enhancement of heat transfer and heat transport in thermal devices using liquid-vapor phase change phenomena
Project Year：
Process intensification of thermo-chemical energy conversion
Project Year：
Boiling -Research and Advances- (Y.Koizumi, M.Shoji, M.Monde, Y.Takata, N.Nagai (Eds.))
Kunito Okuyama（ Role： Joint author , 6.4 Transient boiling under rapid heating conditions）
Elsevier （ ISBN:9780081010105 ）
Total pages：848 Responsible for pages：504-519 Language：English Book type：Scholarly book
化学工学辞典（化学工学会編、改訂4版）
（ Role： Joint author）
丸善
Language：Japanese Book type：Scholarly book
熱物性ハンドブック(日本熱物性学会編)
（ Role： Joint author）
養賢堂
Language：Japanese Book type：Scholarly book
Passive production of synthesis gas from liquid methanol using a packed bed of porous material particles
Kunito Okuyama, Kanoko Ichimi, Masato Takazawa, Asami Natori, Mikako Tanaka
International Journal of Heat and Mass Transfer 128 1017 - 1025 2019.1 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
Liquid-solid contact behavior of a minute liquid droplet impinging on a hot solid surface
TAJIMA Hayato, KOBAYASHI Yusuke, OKUYAMA Kunito
Transactions of the JSME (in Japanese) 87 ( 904 ) 1 - 12 2021.12 [Reviewed]
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
<p>The dynamic contact behavior of a minute liquid droplet upon the collision with a high temperature solid is investigated using total internal reflection imaging. An inkjet water droplet collides with a high temperature surface of sapphire and quartz glass prisms then splashes away. Contact behaviors captured from back using a nanosecond lighting stroboscope vary dramatically with the contact temperature <i>T<sub>c</sub></i> based on the heat conduction theory rather than the solid temperature <i>T<sub>s</sub></i> and are classified into four regions, (I) film evaporation, (II) nucleate boiling, (III) spontaneous nucleation and (IV) supercritical state regions. Contact area decreases significantly in the region (II) to show a minimum at a temperature close to the limit of liquid superheat, then increases in the region (III) to reach a maximum at a temperature close to the critical temperature before decreasing at higher temperatures. Even at a contact temperature so high as to exceed the critical temperature, liquid still contacts the solid surface over a significant area for several microseconds before drying up of the surface. The fine bubbles generated due to spontaneous nucleation hinders the contact due to the formation of the local dried area as the contact temperature approaches the superheat limit, whereas the contact is rather enhanced at further higher temperatures due to the dynamic action of spontaneous nucleation. Similar behaviors are observed for the quartz glass prism in the same range of the contact temperature.</p>
OKUYAMA Kunito, SHIBATA Hiroki, IWAMOTO Rei
Transactions of the JSME (in Japanese) 87 ( 902 ) 1 - 14 2021.10 [Reviewed]
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
A single, straight-tube pulsating heat pipe (SST-PHP) with an open end that was proposed by the authors' research group provides a high heat transport rate of 75 W with an effective thermal conductivity of 40 kW/(m・K) due to a self-excited, large amplitude, periodical oscillation of a single vapor plug. Liquid film surrounding the vapor plug is pushed back to the heating section to spread over the wick for each shrinkage of the plug, which maintains the heating section near the saturation temperature of the working liquid. In the present paper, first, the variation of the amount of liquid contained in the heating section during the oscillation is examined through the measurement of the vapor volume in the parts of the pipe. The dynamic inflow/outflow of the liquid film to/from the heating section and its relation to the occurrence of the dry-out are discussed. Secondly, the temperature variation across the liquid film that flows out along with the vapor plug into the heat transport tube is estimated with reference to the analytical solution of the temperature distribution in a liquid column oscillating with the same amplitude as that of the vapor plug. The effect of the heat transfer from the tube (temperature drop) reaches the location of the liquid film surface with a time delay around a quarter of the oscillation period. It would imply that the condensation of vapor on the film surface begins at around the maximum growth of the vapor plug, as a result, leading to the large-amplitude oscillation.
Other Link： https://ci.nii.ac.jp/naid/130008097951
Kunito Okuyama, Satomi Kawanishi, Risa Aoki
Applied Thermal Engineering 176 115358 2020.5 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier, Ltd. Joint Work
The onset of drying of a porous particle bed immersed in saturated water and heated with a high surface heat flux is investigated. Heating of the top surface of the porous particle bed while the bottom surface is immersed in a bulk liquid induces a decrease in the local liquid saturation due to evaporation and the liquid flow toward the heated surface due to capillary action. As long as the liquid flow is sufficient to sustain wetting of the surface, the porous medium functions as a heat sink by evaporative cooling. However, at higher heat fluxes, a dried region
may form in the proximity of the heated surface, which causes significant deterioration of the heat transfer from the heat source due to thermal resistance. Two-phase flow in a porous particle bed immersed in a saturated liquid and heated with a high surface heat flux is analyzed based on a one-dimensional model. The calculated liquid saturation distribution and heat flux at the emergence of drying almost agree with the measured distribution and heat flux. The estimation with the model suggests that the heat flux at the onset of drying increases proportionally to the square root of the permeability of the porous medium up to as high as 0.1–10 MW/m2.
Other Link： https://www.journals.elsevier.com/applied-thermal-engineering
Measurement of a Heated Surface Temperature Using a High-Speed Infrared Camera During Critical Heat Flux Enhancement by a Honeycomb Porous Plate in a Saturated Pool Boiling of a Nanofluid
Mori Shoji, Aznam Suazlan Mt, Yanagisawa Ryuta, Yokomatsu Fumihisa, Okuyama Kunito
HEAT TRANSFER ENGINEERING 2019.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
冷却器及びそれを用いた冷却装置、並びに発熱体の冷却方法
森昌司、奥山邦人
Applicant：横浜国立大学
Application no：特願2016-519269 Date applied：2015.5.12
Publication no：W02015/174423 Date published：2015.11.19
Patent/Registration no：特許6283410 Date issued：2018.2.2
Country of applicant：Domestic
発熱体を冷却するための沸騰方式による冷却器であって、 作動流体を収容する容器と、 前記容器内において、前記作動流体と接するように且つ前記発熱体に対向するように設けられた冷却部材と を備え、前記冷却部材は、前記発熱体側に設けられた多孔質体と、前記作動流体側に設けられた 作動流体導入体とを備えた積層構造に構成され、前記多孔質体は、毛細管現象により前記作動流体を前記発熱体との接触部に供給する作 10 動流体供給部と、前記接触部で発生した蒸気を前記作動流体導入体側へ排出する蒸気排出 部とを備え、
前記作動流体導入体は、前記作動流体を前記多孔質体に導く作動流体導入部を備える冷 却器。
水素生成装置及び水素生成方法
奥山邦人
Applicant：国立大学法人横浜国立大学
Application no：特願2013-272855 Date applied：2013.12.27
Country of applicant：Domestic
可撓性部材内に充填され触媒を担持した粒子状の多孔質体を用い、工場等で生じる廃熱を利用して液体メタノール等の炭化水素系液体原料から効率的に水素を生成する水素生成装置及び水素生成方法。
冷却器及びそれを用いた冷却装置、並びに、発熱体の冷却方法
森昌司、丸岡成、奥山邦人、原田享、スアズラン ビン エムティ アズナム
Applicant：国立大学法人横浜国立大学
Application no：特願2013-262872 Date applied：2013.12.19
Announcement no：特開2014-206365 Date announced：2014.10.30
Patent/Registration no：特許5882292 Date issued：2016.2.12
Country of applicant：Domestic
過熱水蒸気発生装置及び過熱水蒸気発生方法
森昌司、奥山邦人
Applicant：国立大学法人 横浜国立大学
Application no：特願2013-154405 Date applied：2013.7.25
Country of applicant：Domestic
多孔質体の毛管給水作用と発熱体の加熱作用とを用いて極めて短時間に過熱水蒸気を発生させることができる過熱水蒸気発生装置及び過熱水蒸気発生方法
冷却器及びそれを用いた冷却装置、並びに、発熱体の冷却方法
森昌司、丸岡 成、奥山邦人、原田 享
Applicant：国立大学法人横浜国立大学
Application no：特願2013-055533 Date applied：2013.3.18
Country of applicant：Domestic
簡易な構造で且つ良好な冷却効果を安定して有する冷却器及びそれを用いた冷却装置、並びに、発熱体の冷却方法を提供するものであり、発熱体側に設けられた第１の多孔質体と、作動流体側に設けられた第２の多孔質体とを備えた積層構造を有する。
日本原子力学会賞論文賞
2017.3 日本原子力学会
Individual or group name of awards：森昌司, Suazlan Bin Mt Aznam, 柳沢隆太, 奥山邦人
日本混相流学会賞技術賞
2016.8 日本混相流学会 含水多孔質体を用いた過熱水蒸気の迅速・高効率生成に関する研究
Individual or group name of awards：森昌司, 田中美香子, 奥山邦人
Scientific Contribution Award of the Heat Transfer Society of Japan
2014.5 the Heat Transfer Society of Japan EEnhancement of the critical heat flux in saturated pool boiling using honeycomb porous media
Individual or group name of awards：Shoji MORI, Kunito OKUYAMA
日本伝熱学会賞学術賞
1995
日本機械学会賞研究奨励賞
1992
Application of boiling and evaporation phenomena to engineering processes
Study on Concentration of sea water with high performance by evapration method
Others
Project Year： 2000 - 2002
Heat transfer from High temperature solid to a porous plate containing water
Funded Research offered by Enterprises
Project Year： 1999 - 2002
2022 Seminar C in Chemistry Applications and Life Science
Graduate school of Engineering Science
2022 Chemical Process Engineering
College of Engineering Science
2022 Applied Thermodynamics
College of Engineering Science
2022 Transport Phenomena A
College of Engineering Science
2022 New Generation Chemical Process Engineering Studio S
Graduate school of Engineering Science
日本機械学会論文編修部会論文編修委員会
2011.4 - 2013.3
Committee type：Other
Editor of Journal of Thermal Science and Technology
2008.4 - 2012.3
Committee type：Other
日本機械学会熱工学部門総務委員会
2006.4 - 2008.3 委員
Committee type：Other
化学工学会論文誌編集委員会
2003.4 - 2007.3 編集委員
Committee type：Other
(財)造水促進センター海水淡水化技術評価委員会
1998.7 - 1999.3 評価委員
Committee type：Other
文部科学省委託事業「地域社会人キャリアアップ推進事業」TOBAC社会人キャリアアップ講座 新しい単位操作「伝熱と伝熱操作」
東京湾岸地域大学間コンソーシアムによる社会人キャリアアップ運営協議会(TOBAC) 川崎市 2003.7
