方管两相流中微液膜的测量与分析  

Measurement and Analysis of Square Microchannel Liquid Film in Two-phase Flow

作　　者：张鹏[1,2] 姜玉雁 王涛[1,2] ZHANG Peng;JIANG Yuyan;WANG Tao(Institute of Engineering Thermophysics,Chinese Acadamy of Sciences,Beijing 100190,China;University of Chinese Acadamy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2022年第7期1911-1915,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51876203)。

摘　　要：在微通道流动沸腾换热中,微液膜的蒸发对其起到了至关重要的作用,本文探究了0.6 mm方管在气液两相流条件下的液膜厚度变化,实验通过激光共聚焦位移计测量液膜厚度和高速相机采集图像,实现了同步测量。实验发现,当气泡速度小于1.27 m/s时,液体会集中在方管的四角,不会形成液膜;当气泡速度为1.21~2.71 m/s时,会在管壁形成液膜,液膜的变化呈阶梯式,并且随着气泡速度增大而增大;当气泡速度大于3.21 m/s时,流型会转变为环状流,液膜厚度会开始出现振荡。In the microchannel flow boiling heat transfer,the evaporation of liquid film plays an important role.This paper explores the change of liquid film thickness of 0.6 mm square microchannel under the condition of two-phase flow.In the experiment,the liquid film thickness measured by laser confocal displacement meter and images collected by high-speed camera were synchronized.The experimental results show that when the bubble velocity is less than 1.27 m/s,the liquid will concentrate in the four corners of the square microchannel and will mot form a liquid film.When the bubble velocity is 1.21~2.71 m/s,liquid film will be formed on the tube wall,and the change of liquid film is in a step type and increases with the increases of bubble velocity.When the bubble velocity is greater than 3.21 m/s,the flow pattern will change into annular flow,and the liquid film thickness will start to fluctuate.

关 键 词：气液两相流 微方管 液膜厚度 同步测量 

分 类 号：TK124[动力工程及工程热物理—工程热物理]