2022 Fiscal Year Final Research Report
Enhancement of Condensation Heat Transfer on Bi-philic Condensing Surface with Wettability Gradient and the Application to Fuel Cells
| Project/Area Number |
19K04227
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Ube National College of Technology |
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Principal Investigator |
Tokunaga Atsushi 宇部工業高等専門学校, 機械工学科, 准教授 (20609797)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 凝縮伝熱促進 / MEMS / 滴状凝縮 / 濡れ性勾配 |
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| Outline of Final Research Achievements |
The bi-philic condensing surface with a wettability gradient was fabricated to enhance the condensation heat transfer, and the condensation experiment has been carried out the to verify effect of the bi-philic condensing surface on condensation heat transfer. The wettability gradient was formed by gradually changing the pattern width of the hydrophilic surface. Therefore, the droplet could move from the hydrophobic area to the hydrophilic area by the difference of the contact angle between the frontward side and backward side of the droplet.During the research period, the optimal condensing surface with wettability gradient was investigated and the enhancement of the condensation heat transfer rate on the condensing surface with the periodic wettability gradient was also examined. As a result, the enhancement of the heat transfer rate was achieved, however the optimum shape is still an issue to be investigated.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
濡れ性勾配を有する複合伝熱面を活用した凝縮伝熱促進に取り組んでいる．この伝熱面によって液滴を輸送することが可能であり，また微小な液滴を活用した伝熱促進を実現した．本研究成果はデバイスへの応用展開が期待でき，例えばヒートパイプなどへの活用が考えられる．凝縮伝熱促進によってヒートパイプなどの性能の向上が達成されれば，スマートフォンやパソコンの小型化・高性能化を実現できるなど産業界への貢献度は極めて高いものである．
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