匀强电场作用下分散相液滴的变形和破裂

doi:10.3969/j.issn.0438-1157.2014.03.011

化工学报 ›› 2014, Vol. 65 ›› Issue (3): 843-848.DOI: 10.3969/j.issn.0438-1157.2014.03.011

匀强电场作用下分散相液滴的变形和破裂

梁猛¹, 李青¹, 王奎升¹, 刘竞业², 陈家庆³

1 北京化工大学机电工程学院, 北京 100029;
2 北京化工大学理学院, 北京 100029;
3 北京石油化工学院机械工程学院, 北京 102617

收稿日期:2013-05-28 修回日期:2013-08-28 出版日期:2014-03-05 发布日期:2014-03-05
通讯作者: 王奎升
作者简介:梁猛（1988—），男，硕士研究生。
基金资助:
国家自然科学基金项目（51076007/E060203）；中央基础研究基金项目；北京市与中央高校共建项目。

Deformation and breakup of dispersed phase droplets in uniform electric field

LIANG Meng¹, LI Qing¹, WANG Kuisheng¹, LIU Jingye², CHEN Jiaqing³

1 College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2 College of Science, Beijing University of Chemical Technology, Beijing 100029, China;
3 College of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Received:2013-05-28 Revised:2013-08-28 Online:2014-03-05 Published:2014-03-05
Supported by:
supported by the National Natural Science Foundation of China (51076007/E060203), the Central Basic Research Foundation and the Construction Project between Beijing and Central University.

摘要/Abstract

摘要： 基于Cahn-Hilliard方程的相场方法，建立了在匀强电场作用下液滴的变形和破裂行为模型。从微观角度研究分散相液滴变形过程中电荷密度、电场强度和电场力的分布规律以及流场和电场分布，探讨了微观液滴变形机理；采用数值模拟方法研究了电场强度、液滴直径和界面张力对液滴变形的影响，结果表明电场强度越强，液滴直径越大，界面张力越小，液滴变形量越大；分析了液滴的两种主要破裂方式，其破裂主要取决于连续相和分散相物性条件，为电破乳技术提供了理论基础。

关键词: 相场方法, 数值模拟, 变形, 破裂, 匀强电场, 界面, 数学模型

Abstract: Through coupling hydrodynamics and electrostatics, a phase field method based on Cahn-Hilliard formulation was used to predict the deformation and breakup of dispersed phase droplets in a uniform electric field. The distribution of charge density, electric field strength and electric field force on the droplet surface as well as the distribution of flow field and electric field were studied from the micro-perspective. The micro-droplet deformation mechanism was established. The influence of electric field strength, droplet diameter and interfacial tension on the deformation was predicted by numerical simulation. The results showed that strong electric field intensity, large droplet diameter or small interfacial tension could cause larger degree of droplet deformation. The droplet mainly ruptured from its middle or the two ends. Rupture mainly depended on the physical properties of the continuous phase and dispersed phase. The above study would provide a theoretical basis for complex electric demulsification.

Key words: phase field method, numerical simulation, deformation, breakup, uniform electric field, interface, mathematics model

中图分类号:

TE624.1

梁猛, 李青, 王奎升, 刘竞业, 陈家庆. 匀强电场作用下分散相液滴的变形和破裂[J]. 化工学报, 2014, 65(3): 843-848.

LIANG Meng, LI Qing, WANG Kuisheng, LIU Jingye, CHEN Jiaqing. Deformation and breakup of dispersed phase droplets in uniform electric field[J]. CIESC Journal, 2014, 65(3): 843-848.

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匀强电场作用下分散相液滴的变形和破裂

Deformation and breakup of dispersed phase droplets in uniform electric field

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