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) | |
发表期刊 | PHYSICAL REVIEW APPLIED |
2015-08-07 | |
卷号 | 4期号:2页码:24005 |
ISSN | 2331-7019 |
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. |
学科领域 | Physics |
DOI | 10.1103/PhysRevApplied.4.024005 |
URL | 查看原文 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000359120600001 |
WOS研究方向 | Physics |
WOS类目 | Physics, Applied |
项目资助者 | MOST [2011CB707604] ; NSFC [11402274, 11272321] |
论文分区 | 一类 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/55325 |
专题 | 非线性力学国家重点实验室 |
通讯作者 | Hu GQ(胡国庆) |
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. |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
IMCAS-J2015-132.pdf(4901KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 下载 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论