Open Access

ARTICLE

RECENT ADVANCES OF SURFACE WETTABILITY EFFECT ON FLOW BOILING HEAT TRANSFER PERFORMANCE

by

a School of Energy and Power Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
b Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206,China
* Corresponding author. Email: caos@zzuli.edu.cn
† Corresponding author. Email: xiejian90@ncepu.edu.cn

Frontiers in Heat and Mass Transfer 2021, 17, 1-16. https://doi.org/10.5098/hmt.17.17

Abstract

Flow boiling heat transfer is an effective way to fulfill the energy transfer. The wettability of boiling surface influences the liquid spreading ability and the growth, departure, and release frequency of bubbles, which determines the heat transfer performance. According to the wettability and combination forms, boiling surface are classified into weak wetting surface, strong wetting surface, and heterogeneous wetting surface. Fabricating by physical, chemical method or coating the original surface with a layer of low surface energy, the weak wetting surface has more effective activation point and nucleation center density to improve heat transfer performance at low heat flux. The strong wetting surface always formed by physical or chemical treatment to enhance the rapid rewetting of the wall surface. It has a smaller bubble separation diameter, higher separation frequency and higher CHF. The heterogeneous wetting surface, having the synthetic effects of the strong and weak surface wettabilities, is a hot issue of recent study. But its composition and heat transfer enhancement mechanism are very complicated which need to study thoroughly. Furthermore, the intelligent wetting surface, having the dynamics wettability function, is also briefly analyzed in this paper. Despite the advances in this aspect, the boiling surfaces can be further optimized by fabricate effective wettability to achieve a strong stability, high heat transfer performance and realize the synergistic effect of flow pattern and heat transfer.

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Keywords

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