2021 Fiscal Year Final Research Report
Effect of Bubble Coalescence on Boiling Heat Transfer to Achieve High Heat Flux Heat Removal
| Project/Area Number |
19K14904
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Kanagawa University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 核沸騰 / ミクロ液膜 / 気泡の合体 / 気泡間液膜厚さ |
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| Outline of Final Research Achievements |
In this study, we clarified the influence of bubble interference on boiling heat transfer by using the thin liquid film measurement method we have developed so far through the following two tasks. (1) To understand the process from the formation to the disappearance of a thin liquid film with extremely good heat transfer formed just below a boiling bubble. (2) Precise measurement of the thickness change of the liquid film between bubbles during the coalescence process is carried out to clarify the distribution of the thickness between bubbles and its change characteristics. As a result, the dynamic behavior of the thin liquid film on the heat transfer surface and the evaporation process under high heat flux conditions with bubble coalescence were observed. The influence of the bulk liquid temperature on the bubble coalescence process was clarified, and the trend of the liquid film thickness between bubbles during the bubble coalescence was also clarified.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究を通して，気泡合体を伴う高熱流束条件下における伝熱面上の薄液膜の動的な挙動および蒸発過程の観察が出来た．このことは，伝熱面への液の供給といった核沸騰伝熱の限界を明確にするために非常に重要な情報となる．また，気泡合体過程におけるバルク液温の影響を明らかにすることで，気泡合体時の気泡間液膜厚さの傾向を明らかにした．これは，気泡の合体という素過程の合体条件を明らかにする上で欠かせないデータとなる．
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