均匀直流电场作用下贴壁气泡变形特性  

Investigation on deformation behavior of single bubble attached to solid wall under effect of uniform DC electric field

作　　者：王太 陈烁 李典 刘清元 谢英柏[1] 刘春涛[1] WANG Tai;CHEN Shuo;LI Dian;LIU Qingyuan;XIE Yingbai;LIU Chuntao(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《中南大学学报（自然科学版）》2021年第12期4531-4539,共9页Journal of Central South University:Science and Technology

基　　金：河北省自然科学基金资助项目(E2019502151);中央高校基本科研业务费专项资金资助项目(2018MS105)。

摘　　要：为了获得均匀直流电场作用下贴壁气泡的变形特性,开发电场力模型,并与基于轴对称坐标系的VOSET方法相耦合,采用数值模拟的方法研究电场力、浮升力、表面张力、毛细力对气泡变形的影响。同时,开展可视化实验对数值算法进行验证。研究结果表明:电势与电场在气液界面附近发生扭曲,电场力指向气泡内部,挤压气泡沿电场方向伸长;电场强度与液体介电常数越大,电场力越大,气泡变形越明显;浮升力作用减弱,表面张力与电场力作用增强,气泡高度明显增加;表面张力具有维持气泡形状的能力,表面张力系数越小,当无外加电场时,气泡高度越小,施加电场后,气泡高度随电场强度增加而增大的幅度越大;接触角越大,气泡高度随电场强度增加而增大的幅度越大。In order to obtain the deformation behavior of single bubble attached to the solid wall under the effect of uniform DC electric field,the VOSET method based on the axisymmetric coordinate coupled with electric field force model was used to investigate the effect of electric field force,buoyancy force,surface tension and capillary force on bubble deformation.The visualized experiment was performed to verify the numerical simulation algorithm.The results show that the electric potential and electric field are distorted around the gas-liquid interface.Under the extrusion action of electric field force pointing to the interior of the bubble,the bubble elongates along the direction of the electric field.The larger electric field strength and dielectric constant of liquid will lead to the greater the electric field force and the more obvious bubble deformation.The effect of buoyancy force is weakened,the effect of surface tension and electric field force is enhanced,and the bubble height is increased obviously.The surface tension has the ability to maintain the bubble shape.With the decrease of the surface tension coefficient,the bubble height decreases in the absence of electric field,but in the case of applying electric field,it has the larger increasing amplitude with the increase in the electric fileld strength.With the increase of the contact angle,the bubble height has the larger increasing amplitude with the increase of the electric field strength.

关 键 词：气泡 电场 电场力 VOSET方法 数值模拟 

分 类 号：TK121[动力工程及工程热物理—工程热物理]