Effect of pin electrodes on flow boiling heat transfer and bubble dynamic behaviors in vertical minichannels

被引：4

作者：

Zhang, Jinxin ^{[1
]}

Luo, Xiaoping ^{[1
]}

Feng, Zhenfei ^{[2
]}

机构：

[1] South China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510641, Guangdong, Peoples R China

[2] Guangxi Univ, Sch Mech Engn, Nanning 530004, Guangxi, Peoples R China

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2024年 / 200卷

基金：

中国国家自然科学基金;

关键词：

Mini; -channel; Flow boiling; Electrohydrodynamic; Heat transfer enhancement; 2-PHASE FLOW; FIELD; ENHANCEMENT; CHANNELS; PERFORMANCE; GROWTH; PHASE;

D O I：

10.1016/j.ijthermalsci.2024.108964

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Electrohydrodynamic can significantly improve flow boiling heat transfer. However, pin electrode configuration has not been investigated comprehensively. This study explores the flow boiling performance of vertical minichannels in non-uniform electric field formed by pin electrode. The influences of pin electrode spacing and array region on flow pattern and heat transfer under electric field are studied. Flow patterns of bubbly, slug and confined bubble flow were captured and analyzed by using visualization techniques. The results demonstrate that the volume of bubbles decreases and the number increases under electric field. Besides, electric field mitigates bubble coalescence and delays the flow pattern transition. The electric field enhancement ratio is up to 1.64. The enhancement effect of these tested electrode configurations is related to the length to diameter ratio for the bubble. Under present experimental conditions, when the average length-to-diameter ratio exceeds 3.12, the electric field enhancement effect begins to diminish. In the theoretical aspect, we perform numerical simulations of the detachment behavior of the bubbles under different electrode arrangements. Furthermore, simulations of the bubble detachment process under an electric field are carried out to investigate the enhanced mechanism of pin electrode on minichannel flow boiling.

引用

页数：17

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