脉冲电场下液滴极化变形的数值模拟  

Numerical Simulation of Polarization and Deformation of Droplet under Pulsed Electric Field

作　　者：孙治谦[1] 范玉玲 张孟奇 李彬 王振波[1] 黄玫 Sun Zhiqian;Fan Yuling;Zhang Mengqi;Li Bin;Wang Zhenbo;Huang Mei(College of Chemical Engineering,China University of Petroleum(Huadong;School of Energy and Power Engineering,Jiangsu University;Wison Engineering(China)Ltd.)

机构地区：[1]中国石油大学(华东)化学工程学院,山东省青岛市266580 [2]江苏大学能源与动力工程学院 [3]惠生工程(中国)有限公司

出　　处：《石油机械》2019年第12期82-87,共6页China Petroleum Machinery

基　　金：国家自然科学基金项目“基于EHD的W/O乳状液脉冲静电破乳多尺度微观机理研究”(21406267);中央高校基本科研业务费专项资金资助项目“W/O乳状液中水、无机盐、有机金属化合物、有机酸等多杂质静电联合脱除机制研究”(18CX02122A);重质油国家重点实验室资助项目“重劣质原油高频脉冲电场无机盐/有机酸/有机金属化合物联合脱除技术研究”(SLKZZ-2017013)

摘　　要：为深入探究脉冲电场下的电脱水机制,基于COMSOL技术,采用电场和流场耦合的相场方法,建立了在脉冲电场下油包水乳状液液滴极化变形的二维模型,研究了液滴极化变形的影响规律。研究结果表明:随着电场强度的增加,液滴振荡变形的幅值增大,液滴变形度曲线上升沿的过冲现象逐渐减弱,下降沿的过冲现象逐渐增强;随着液滴界面张力的减小,液滴抵抗电场极化变形的能力大幅降低,其极化变形程度以及随脉冲电场的振荡幅度显著增大;随着电场频率增加,乳状液容性负载变化,液滴受到的偶极聚结力小幅增大,极化变形程度提高,液滴变形周期缩短;随着液滴粒径的增大,施加于液滴两端的电场力增大,液滴内外压差减小,液滴的变形度及振荡幅度增大。研究结果可为脉冲电场静电破乳机理的深入研究提供理论依据。To deeply explore the electric dehydration mechanism under pulsed electric field, a two-dimensional model of the polarization and deformation of water-in-oil emulsion droplet under pulsed electric field is established based on COMSOL technology and using phase field method of electric field and flow field coupling. The results show that with the increase of electric field strength, the amplitude of droplet oscillation deformation increases. The overshoot phenomenon of the rising edge of droplet deformation curve gradually weakens, and the overshoot phenomenon of the falling edge gradually increases. With the reduction of the droplet interfacial tension, droplet’s resistance to the polarization deformation of the electric field is greatly reduced. The degree of polarization and deformation and the oscillation amplitude with the pulse electric field increase significantly. As the frequency of the electric field increases, the capacitive load of the emulsion changes, the polar coalescence force on the droplet increases slightly, the degree of polarization and deformation rises, and the droplet deformation period shortens. As the droplet size increases, the electric field force applied to both ends of the droplet increases, the pressure difference between the inside and outside of the droplet decreases, and the deformation degree and the oscillation amplitude rise. The study results can provide a theoretical basis for the in-depth mechanism study of the electrostatic demulsification using pulsed electric field.

关 键 词：相场方法 脉冲电场 液滴变形 数值模拟 

分 类 号：TE624.1[石油与天然气工程—油气加工工程]