微通道过冷流动沸腾汽泡动力学行为研究  

Study on the Bubble Dynamic Behavior of Subcooled Flow Boiling in Microchannel

作　　者：邱俊城 李强[1] 陈雪梅 QIU Jun-Cheng;LI Qiang;CHEN Xue-Mei(School of energy and power engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学能源与动力工程学院电子设备热控制工信部重点实验室,南京210094

出　　处：《工程热物理学报》2021年第10期2665-2671,共7页Journal of Engineering Thermophysics

基　　金：国家磁约束核聚变能发展研究专项资助(No.2018YFE0312300);国家自然科学基金(No.51706100);江苏省自然科学基金(No.BK20180477);中央高校基本科研业务费专项资金资助(No.30918011205)。

摘　　要：微通道相变冷却技术在高热流密度散热领域具有广泛的应用前景,本文通过FLUENT内的流体体积VOF模型来建立过冷流动沸腾下微通道内单汽泡生长模型,通过用户自定义函数UDF在汽液界面上添加质量源项和能量源项实现相变。研究结果表明,汽泡的上游接触角恒大于下游接触角,汽泡的大小随时间先呈幂函数增长,开始受限后则随时间线性增长。随着入口速度的降低、壁面过热度的提高与入口过冷度的降低,汽泡的生长速度均能加快,受限时间均可提前。Microchannel phase change cooling technology has a wide application in the heat dissipation with high heat flux.In this paper,the volume of fluid(VOF)model in FLUENT was used to establish the single bubble growth model in microchannel under condition of subcooled flow boiling.The user-defined function(UDF)was used to realize the phase change by adding the mass source term and energy source term on the vapor-liquid interface.The results show that the upstream contact angle of the bubble is always larger than that of the downstream contact angle;the size of the bubble increases with time following a power function at first,and then increases linearly with time as soon as the growth is restricted.The growth speed of the bubble can be accelerated and the growth restriction time can be advanced with the decrease of inlet velocity,the increase of wall superheat as well as the decrease of inlet subcooling.

关 键 词：微通道 过冷流动沸腾 汽泡 受限生长 

分 类 号：TK121[动力工程及工程热物理—工程热物理]