Experimental study on the effect of orientation on flow boiling using R134a in a mini-channel evaporator

被引：21
作者：
Gao, Wuhuan [1 ]
Xu, Xianghua [1 ]
Liang, Xingang [1 ]
机构：
[1] Tsinghua Univ, Sch Aerosp, Beijing, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2017年 / 121卷
基金：
中国国家自然科学基金;
关键词：
Flow boiling; Gravitational effects; Mini-channel; HEAT-TRANSFER; PRESSURE-DROP; TRANSITION; GRAVITY;
D O I：
10.1016/j.applthermaleng.2017.04.019
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The influence of gravity on flow boiling poses a challenge to the development of two-phase thermal systems for space applications. The present study investigates the heat transfer coefficient of flow boiling in a mini-channel evaporator in both horizontal and vertically downward flow directions to observe the effect of gravity. The evaporator has 23 channels that are 624 mu m in width and 923 pm in depth. The experiments show that nucleate boiling dominates the heat transfer. The heat transfer and flow patterns for the two directions differ when the mass flow rate is less than 264.3 kg/m(2) s and the heat flux is less than 3.0 W/cm(2). The experimental results are compared with five general correlations. The outlet Froude number is more suitable for correlating the results than existing gravity-independent criteria. Gravity may influence the heat transfer through instabilities and changes in the flow patterns. (C) 2017 Published by Elsevier Ltd.
引用
收藏
页码：963 / 973
页数：11
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