直流电场作用下油中异性水滴聚并特征  

Coalescence Characteristics of Water Droplets in Oil Under DC Electric Field

作　　者：尹浩然 罗小明[1,2] 任静 徐珂 闫海鹏 YIN Hao-Ran;LUO Xiao-Ming;REN Jing;XU Ke;YAN Hai-Peng(College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China;Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety,Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,青岛266580 [2]山东省油气储运安全省级重点实验室,青岛266580

出　　处：《工程热物理学报》2020年第8期1940-1946,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51874341)。

摘　　要：采用显微实验与理论分析相结合的方法,对直流电场作用下异性水滴聚并过程中的界面和体相演变进行了系统研究。结果表明,水滴间的界面张力梯度不仅导致了液桥的不对称性,而且引发了蘑菇头形状射流,导致了水滴的混合。不对称液桥的演变可以通过一个包含界面张力梯度的特征时间来描述。增加水滴界面张力差可以增加射流深度和速度,强化水滴的混合,并基于能量转化关系,提出了异性水滴的混合机理。The evolution of interface and bulk phase in the process of heterogenous water droplet coalescence under DC electric field was studied by means of the combination of microscopic experiment and theoretical analysis.The results show that the interfacial tension gradient between water droplets not only leads to the asymmetry of the liquid bridge,but also leads to the mushroom shaped jet,which leads to the mixing of water droplets.The evolution of asymmetric liquid bridges can be described by a characteristic time including the interfacial tension gradient.Increasing the interfacial tension difference can increase the jet depth and velocity,and enhance the mixing of water droplets.Based on the relationship of energy conversion,the mixing mechanism of water droplets with different properties is proposed.

关 键 词：直流电场 液桥演变 体相射流 体相混合 

分 类 号：TK123[动力工程及工程热物理—工程热物理]