Enhancement of nucleate boiling by temporary modulation of wettability during the bubble dynamic process

被引：0
|
作者：
Chen H. [1 ]
Li L. [1 ]
Gao X. [1 ]
Wang Y. [1 ]
Guo Y. [1 ]
机构：
[1] School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 04期
关键词：
Bubble dynamic; Nucleate boiling; Numerical simulation; Temporary modulation; Wettability;
D O I：
10.11949/0438-1157.20211719
中图分类号：
学科分类号：
摘要：
Enhancement of nucleate boiling heat transfer using wettability modification on porous or micro-structured surfaces has been studied extensively. The CFD-VOF method is used to accurately study the nucleate boiling enhanced by surface temporary modulation in the growth and the departure regimes of single bubble boiling on silicon micropillar structured surface. To comparatively study the effect of wettability temporary modulation on bubble dynamics and heat transfer performance, initial contact angle is set at 48°, 60°, 90° and 110° respectively, then is modulated to 20° at t = 0.152 ms. The results show that the hydrophobicity can increase the bubble growing rate, the adhesion force between the bubble and micropillars, and promote the bubble spreading along the gaps between the micropillars. At t = 0.150 ms, the contact area between the bubble and the surface with the contact angle at 110° is increased by 1.3 times, and the microlayer evaporation rate is increased by 1.2 times. The hydrophilicity reduces the proportion of the detachment time in the whole cycle, the average evaporation power at the detachment time increases by 33.3%, and the surface heat transfer performance is enhanced throughout the process. © 2022, Editorial Board of CIESC Journal. All right reserved.
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页码：1557 / 1565
页数：8
相关论文
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