物性对电场下单气泡行为的影响  

THE PROPERTY INFLUENCES ON BUBBLE BEHAVIOR UNDER ELECTRIC FIELDS

作　　者：彭耀[1] 陈凤[1] 宋耀祖[1] 陈民[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《工程热物理学报》2008年第10期1762-1764,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划项目(No.G2000026301)

摘　　要：对电场作用下单气泡行为特点的研究有助于分析电场强化沸腾换热的机理.在本文中,利用VOF方法研究了气泡在直流电场下从壁面上升的过程,分析了液相相对介电常数及气液表面张力系数两种物性对单气泡行为的影响.研究发现,随着液相相对介电常数的增大,气泡脱离时间缩短,变形增加,内部对流增强.气液表面张力系数的增加能够延长气泡的脱离时间,但对气泡形态及内部流场的影响较弱.The research on bubble behavior under electric fields helps to analyze the mechanism of electric field enhancement of boiling heat transfer. The bubble detachment from the wall was investigated by using VOF method in this paper. The influences of surface tension and liquid dielectric constant on the bubble behavior were analyzed. It shows that the bubble detachment time reduces, bubble deformation and inner convection increase as liquid dielectric constant increases. However, the increase of surface tension elongates the detachment time and has little effect on bubble contour and inner convection.

关 键 词：多相流 数值模拟 电场 气泡 

分 类 号：TK124[动力工程及工程热物理—工程热物理]