Numerical Simulation of Pool Boiling on Novel Microstructured Heated Surface

Chen Xu, Yizhou Wang (), Xinrong Zhang (), Wenyi Li and Jieru Li
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Chen Xu: School of Mechanics and Engineering Science, Peking University, Beijing 100871, China
Yizhou Wang: School of Mechanics and Engineering Science, Peking University, Beijing 100871, China
Xinrong Zhang: School of Mechanics and Engineering Science, Peking University, Beijing 100871, China
Wenyi Li: Peking University Ordos Research Institute of Energy, Ordos 017000, China
Jieru Li: Peking University Ordos Research Institute of Energy, Ordos 017000, China

Energies, 2025, vol. 18, issue 18, 1-15

Abstract: Improving the pool boiling heat transfer by changing the properties of the heating surface has been experimentally studied by many researchers. In this paper, two novel microstructured surfaces with open channels were simulated and investigated. The two microstructured surfaces had different cavity positions and different groove widths of open channels. At the same time, a pool boiling experiment on the plain-heated surface was carried out to verify the reliability and accuracy of the CFD model. The results showed the relationship between the heat flux and wall superheat. Moreover, the bubble dynamic behaviors of different surfaces were obtained. It was found that both microstructured surfaces could enhance the pool boiling heat transfer coefficient (HTC) and critical heat flux (CHF). Enlarging the length of the groove gap can not only increase the heat transfer area, but also increase the bubble nucleation rate. However, constantly increasing the groove width will cause the horizontal coalescence of bubbles on the heating surface at low heat flux. When the negative effect of bubble coalescence is higher than the enhancement effect, the boiling heat transfer capacity of the heating surface will decrease unless the heat flux is high enough to delay bubble coalescence.

Keywords: open-channel microstructured surface; CFD simulation; bubble departure frequency and diameter; heat transfer coefficient; critical heat flux (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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