Bubble dynamics and flow boiling instabilities in microchannels
Bubble dynamics and flow boiling instabilities in microchannels
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DOI：
10.1016/j.ijheatmasstransfer.2012.11.038
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发表时间：
2013-03-01
影响因子：
5.2
通讯作者：
Walton, A. J.
中科院分区：
文献类型：
--
作者：
Bogojevic, D.;Sefiane, K.;Walton, A. J.
本文对多微通道热沉中的气泡动力学及其对流动沸腾不稳定性和传热的影响进行了实验研究。在本文中，气泡动力学的实验研究结果的介绍和讨论。微通道散热器包含40个平行的矩形通道，其水力直径为194 μ m，纵横比为0.549。实验使用去离子水进行，质量通量范围为71至204 kg/m（2）s，入口温度为71 ℃。利用显微镜和高速摄像机研究了过冷和饱和流动沸腾条件下汽泡的生长速率和脱离直径。研究了质量流量和热流密度对气泡生长特性的影响。研究结果表明，微尺度通道中的气泡生长速率与宏观尺度通道中的气泡生长速率不同。微通道内气泡的动力学特性是由于微通道的封闭性和通道间的相互作用而形成的。皇冠版权所有（C）2012由爱思唯尔有限公司出版。保留所有权利。
This work describes an experimental investigation of bubble dynamics and the effect on flow boiling instabilities and heat transfer in a multiple-microchannel heat sink. In this paper, results of the experimental investigation of bubble dynamics are presented and discussed. The microchannel heat sink contained 40 parallel, rectangular channels having hydraulic diameter of 194 mu m, and an aspect ratio of 0.549. The experiments were conducted with deionised water over a mass flux range from 71 to 204 kg/m(2) s, and an inlet temperature of 71 degrees C. Bubble growth rate and departure diameter under sub-cooled and saturated flow boiling are studied using a microscope and a high speed camera. The effects of mass flux and heat flux on bubbles growth characteristics are investigated and discussed. The results of this study demonstrate that the bubble growth rate in microchannels is different from that in macroscale channels. Confinement of microchannel and interaction between channels result in the unique bubble dynamic in microchannels. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.