交流电场中双液滴不聚并机理研究  

Study on the Non-coalescence Mechanism of Double Droplets Under an Alternating Current Electric Field

作　　者：黄鑫 何利民[2] 罗小明[2] 徐珂 HUANG Xin;HE Limin;LUO Xiaoming;XU Ke(College of Chemical Engineering,Fuzhou University,Fuzhou 350108,China;College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]福州大学石油化工学院,福州350108 [2]中国石油大学(华东)储运与建筑工程学院,青岛266580

出　　处：《工程热物理学报》2022年第5期1247-1253,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52074342,No.51874341,No.51774312)。

摘　　要：本文采用高速显微实验研究了交流电场下双液滴的微观动力学行为,并基于电荷转移理论阐明了双液滴不聚并的理论机制。研究发现:在同一电场频率下,随着电场强度峰值增加,双水滴依次表现为聚并、部分聚并和不聚并行为。随着电场频率的提高,双水滴反弹次数明显增加,双水滴不聚并持续总时间显著延长。在高频交流电场中,液滴尖端射流产生大量极小子液滴,导致双水滴始终维持不聚并状态,为油包水乳状液中形成稳定的长水滴链提供了基础条件。The dynamic behaviors of double droplets under an alternating current(AC) electric field are investigated by high-speed microscopic experiments. The theoretical mechanism of droplet non-coalescence is revealed based on the charge transfer between droplets. The results show that two droplets generally undergo the mode transformation from coalescence to partial coalescence and finally to non-coalescence as the peak strength increases under the same electric field frequency. As the frequency increases, the number of droplet rebound dramatically increases and the duration time of non-coalescence is significantly prolonged. Under the high-frequency AC electric field, two droplets experience non-coalescence all the time due to the existence of a large number of daughter droplets produced by the tip streaming, which is the basis of the formation of stable long droplet chain in water-in-oil emulsion.

关 键 词：静电破乳 交流电场 液滴不聚 电场频率 电荷转移 

分 类 号：TE868[石油与天然气工程—油气储运工程]