Deformation and Interaction of Droplet Pairs in a Microchannel Under ac Electric Fields

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	Deformation and Interaction of Droplet Pairs in a Microchannel Under ac Electric Fields
	Chen XD(陈晓东); Song YX; Li DQ; Hu GQ(胡国庆)
刊名	PHYSICAL REVIEW APPLIED
	2015-08-07
通讯作者邮箱	guoqing.hu@imech.ac.cn
卷号	4 期号:2 页码:24005
ISSN号	2331-7019
通讯作者	Hu, GQ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
产权排序	[Chen, Xiaodong; Hu, Guoqing] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Song, Yongxin; Li, Dongqing] Dalian Maritime Univ, Dept Marine Engn, Dalian 116026, Peoples R China; [Li, Dongqing] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada
中文摘要	The deformation and interaction of a droplet pair in an electric field determine the success of droplet coalescence. Electric intensity and initial droplet separation are crucial parameters in this process. In this work, a combined theoretical and numerical analysis is performed to study the electrohydrodynamics of confined droplet pairs in a rectangular microchannel under ac electric fields. We develop a theoretical model to predict the relationship between critical electric intensity and droplet separation. A geometrical model relating the initial droplet separation to the cone angle is also established to determine the critical separation for partial coalescence. These models are validated by comparisons with existing experimental observations. According to the initial separation and electric intensity, five regimes of droplet interactions are classified by direct numerical simulations, namely noncoalescence, coalescence, partial coalescence, ejection after coalescence, and ejection with partial coalescence. According to their controlling mechanisms, the five regimes are distinguished by three well-defined boundaries. The detailed dynamics of the partial coalescence phenomenon is resolved when the droplet separation exceeds the critical value. A dynamic liquid bridge between the droplets is sustained by the competition between surface tension and electric stress. The dynamics of ejected microjets at the exterior ends are also addressed to showtheir responses to the oscillating electric field. The full understanding of the droplet dynamics under electric fields can be used to predict the droplet fusion behaviors and thus to facilitate the design of droplet-based microfluidic devices.
学科主题	Physics
分类号	一类
类目[WOS]	Physics, Applied
研究领域[WOS]	Physics
收录类别	SCI
原文出处	http://dx.doi.org/10.1103/PhysRevApplied.4.024005
语种	英语
WOS记录号	WOS:000359120600001
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/55325]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Chen XD,Song YX,Li DQ,et al. Deformation and Interaction of Droplet Pairs in a Microchannel Under ac Electric Fields[J]. PHYSICAL REVIEW APPLIED,2015,4(2):24005.
APA	Chen XD,Song YX,Li DQ,&Hu GQ.(2015).Deformation and Interaction of Droplet Pairs in a Microchannel Under ac Electric Fields.PHYSICAL REVIEW APPLIED,4(2),24005.
MLA	Chen XD,et al."Deformation and Interaction of Droplet Pairs in a Microchannel Under ac Electric Fields".PHYSICAL REVIEW APPLIED 4.2(2015):24005.