微重力池沸腾中的气泡和传热行为数值模拟  

Numerical Simulation of Bubble Dynamics and Heat Transfer during Pool Boiling in Microgravity

作　　者：易天浩 陈超越 雷作胜 赵建福[3,4] YI Tianhao;CHEN Chaoyue;LEI Zuosheng;ZHAO Jianfu(State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444;Sino-European School of Technology,Shanghai University,Shanghai 200444;CAS Key Laboratory of Microgravity,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海大学中欧工程技术学院,上海200444 [3]中国科学院力学研究所微重力重点实验室,北京100190 [4]中国科学院大学工程科学学院,北京100049

出　　处：《空间科学学报》2019年第4期469-477,共9页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(51274137,U1860107,U1738105)

摘　　要：基于标准动量传输方程、连续性方程以及能量方程,建立了单个气泡的二维数值模型,考察了微重力过冷核态池内沸腾中的气泡动力学和传热行为.在动量传输方程中耦合了表面张力和Marangoni力,连续性方程和能量方程中耦合了相变效应,考虑了加热面上过热液体层的影响,并引入相场函数捕捉气液界面的动态变化.结果表明:气泡在生长过程中,形状由最初的半球形变为椭球形,最后变为脱附时的梨形;气泡在加热面上自由迁移,呈非轴对称结构,并且气泡上部的温度场呈现为蘑菇云状;气泡的脱附直径正比于g-0.488,脱附周期正比于g-1.113,加热面上的平均热通量正比于g0.229.A two-dimensional model of the single bubble is performed.The surface tension and Marangoni force are included in the momentum equation.In addition,the continuity equation and energy equation are modified to allow for the phase change.A thin superheated layer is considered in the numerical model.The vapor-liquid interface is captured by the phase field method.The variations of bubble dynamics and heat transfer during subcooling pool boiling in microgravity can be obtained by solving the coupled equations.The results show that the bubble changes from a hemisphere to an ellipsoid and eventually becomes a pear shape.The bubble can randomly move on the surface.Besides,the bubble exhibits non-axisymmetrical shape during growth period.Due to the effect of fluid flow,the temperature field above the bubble appears to be a mushroom shape.The bubble departure diameter and departure time are proportional to g-0.488 and g-1.113 respectively.The average heat flux on the heater surface is proportional to g0.229.

关 键 词：微重力 气泡迁移 气泡动力学 池沸腾 传热 

分 类 号：V524[航空宇航科学与技术—人机与环境工程]