基于LBM的均匀电场池沸腾单气泡动力学模拟  

Single Bubble Dynamics in Pool Boiling Under Uniform Electric Field:LBM Simulation

作　　者：张浏斌 单彦广[1] 戎志成 ZHANG Liubin;SHAN Yanguang;RONG Zhicheng(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《计算物理》2022年第5期537-548,共12页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(52176159)资助项目。

摘　　要：采用格子玻尔兹曼方法(LBM),在气-液相变模型的基础上,耦合理想电介质模型,模拟均匀电场作用下池沸腾单气泡成核、生长、脱离过程,详细研究重力加速度和电场强度对气泡动力学的影响。结果表明:在重力加速度相同的情况下,随着电场强度的增加,气泡的脱离直径与脱离时间随之减小,壁面平均热流增加。随着重力加速度减小,壁面平均热流减少,电场强度对于气泡脱离频率的影响更加显著。气泡在均匀电场中形状发生改变,它将沿着电场线的方向拉伸,变得更加细长,电场强度与气泡的纵横比和高度呈线性相关。Lattice Boltzmann method(LBM)is used in a coupled perfect dielectric model and liquid-vapor phase-change model to simulate nucleation,growth,and separation process of a single bubble in pool boiling under uniform electric field.Effects of gravitational acceleration and electric field on bubble dynamics are studied in detail.It shows that under same gravitational acceleration,with the increase of electric field intensity,the bubble departure diameter decreases and the bubble release frequency increases,and the averaged wall heat flux increases.With the decrease of gravitational acceleration,the averaged wall heat flux decreases as well,and the electric field has significant influence on the bubble release frequency.In addition,the bubble deforms in a uniform electric field,and it stretches along the direction of electric field to become slender.The electric field intensity is linearly related to the aspect ratio and height of the bubble.

关 键 词：格子玻尔兹曼方法 池沸腾 均匀电场 气泡动力学 

分 类 号：TK121[动力工程及工程热物理—工程热物理]