电场与拉伸流场共同作用下双重乳液形变特性研究  

Study on Double Emulsion Deformation under Combined Effect of Electric Field and Extensional Flow Field

作　　者：李蕾[1] 余婧雯 吴梁玉 刘向东[1,2] LI Lei;YU Jing-Wen;WU Liang-Yu;LIU Xiang-Dong(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,School of Energy and Environment,Southeast University,Nanjing 210096,China;College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]能源热转换及其过程测控教育部重点实验室东南大学能源与环境学院,南京210096 [2]扬州大学电气与能源动力工程学院,扬州225127

出　　处：《工程热物理学报》2020年第5期1219-1221,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51876184,No.51706194);江苏省自然科学基金资助项目(No.BK20180102);中国博士后科学基金面上资助项目(No.2017M62183);江苏省博士后科研资助计划(No.1701188B);江苏省“六大人才高峰”资助项目(No.JNHB-074)。

摘　　要：本文采用基于Cahn-Hilliard方程的相场方法(Phase-field Method)捕捉液-液流体界面,并利用电流模型(Electric Currents)表征电场力作用,通过电场与多相流控制方程的双向耦合,建立了电场和拉伸流场共同作用下双重乳液形变动力学行为非稳态理论模型并开展数值模拟研究,揭示了流场和电场对双重乳液形变行为的调控机理。研究表明:双重乳液液滴处于单一拉伸流场中外液滴产生宽扁型形变,内液滴产生瘦长型形变;通过施加外加电场可以主动抑制双重乳液的形变,使液滴在拉伸流场中维持球形。Via phase-field method based on Cahn-Hilliard equation to capture the liquid-liquid interface and electric currents model to characterize the electric field force,a transient theoretical model for dynamic behavior of double emulsion deformation is developed via coupling the governing equations of electric field and multiphase fluid flow.Based on the theoretical model,we numerically study the mechanisms underlying the electric control of double emulsion droplet deformation in an extensional flow.It is indicated that without an electric control,the outer droplet and the inner one of the double emulsion are correspondingly deformed into an oblate shape and a prolate shape in the extensional flow.On the other hand,under the suitable electric control,the droplet deformation can be suppressed so that the double emulsion droplet is able to maintain a spherical shape.

关 键 词：双重乳液液滴 电场 形变 调控 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]