2022 Fiscal Year Final Research Report
Development of evaluation method of heat transfer characteristics in droplet impact on moving hot solid
| Project/Area Number |
20K04326
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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 | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 沸騰伝熱 / 移動体冷却 / スプレー冷却 / 逆解析 / 赤外線サーモグラフィー |
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| Outline of Final Research Achievements |
In the heat treatment of steel materials by liquid quenching, it is required to accurately reproduce the predetermined temperature history of the material, and the construction of thermal control technology based on "science" is strongly desired for the advancement of this technology. In this study, we developed an experimental method to observe the collision behaviors of droplet train with a moving hot solid heated far above the boiling temperature, which is a fundamental element of spray cooling in actual processes. Fundamental flow mechanics of droplets in transition and film boiling regimes were experimentally studied in detail. In addition, we developed a new evaluation method for surface heat flux using the heat recovery phenomena immediately after cooling, and verified the availability of the method.
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| Free Research Field |
熱流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で開発した伝熱評価手法は，冷却に寄与しない冷媒を伝熱面から除去することで冷却直後の復熱現象を測定し，その熱伝導解析により強冷却領域の伝熱量を求める点に学術的な独創性がある．この手法は冷媒の除去が容易な遷移沸騰や膜沸騰領域でのみ適用可能であるが，原理的に固体内部の温度から計算する従来法よりも高分解能かつ高精度な計測が可能である．また，この手法は学術的に未解明な遷移沸騰の物理現象の解明に有用であるだけでなく，実操業の熱処理技術の高度化にも貢献できる．
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