电场作用下的气泡生长动力学特性实验研究  

Experimental investigation on dynamic characteristics of bubble generation with electric field

作　　者：张伟[1] 王军锋[1] 詹水清[1] 王东保 许浩洁 ZHANG Wei;WANG Junfeng;ZHAN Shuiqing;WANG Dongbao;XU Haojie(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《中南大学学报（自然科学版）》2022年第8期3202-3211,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51976084);江苏省研究生科技与实践创新计划项目(KYCX19_1599)。

摘　　要：采用高速摄像技术对非均匀电场作用下气泡在无水乙醇中的动力学行为进行可视化研究,结合量纲一化分析,重点研究气体流量和施加电压对气泡生长特性的影响。研究结果表明:气泡的生长过程在无电场和低电场强度下包含成核、稳定增长及颈缩3个阶段,其中稳定增长阶段在高电场强度下难以出现;随雷诺数(Re)和电邦德数(Bo)增大,气泡生长周期缩短,脱离频率和脱离速度加快。以气泡半径表征的气泡动力学特性主要取决于Bo,受Re影响较小;以纵横比(E)表征气泡形态,在无电场情况下,气泡在不同成长阶段对应的E演化特征区别明显,在高Bo条件下,随着电场强度在竖直方向上的快速衰减,E先快速增大而后平稳发展。The dynamic behavior of bubbles in ethanol with the action of a non-uniform electric field was visualized using a high-speed photography, and the effects of gas flow and applied voltage on the bubble generation characteristics were studied in association with dimensionless number analysis. The results show that the bubble formation processes include three stages at low electric field intensity, i. e., the nucleation, stable growth and necking stages, while the stable growth stage is difficult to be observed at high electric field strength.With the increase of the Reynolds number(Re) and electrical Bond number(Bo), the bubble growth period is shortened, and the detachment frequency and velocity are raised. The bubble dynamic properties, characterized by bubble radius, depend mainly on Boand are slightly influenced by Re. The bubble shape characterized by the aspect ratio(E), the evolution of Ecorresponding to different growth stages of bubbles in the absence of electric field is distinctly different. At high Bo, the Efirst increases rapidly and then develops smoothly as the electric field strength decays rapidly in the vertical direction.

关 键 词：电流体动力学(EHD) 气泡生长 气泡半径 气泡形态 电邦德数 

分 类 号：TK175[动力工程及工程热物理—热能工程]