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Induced charge effects on electrokinetic entry flow
Prabhakaran, Rama Aravind; Zhou, Yilong; Zhao, Cunlu; Hu GQ(胡国庆); Song, Yongxin; Wang, Junsheng; Yang, Chun; Xuan, Xiangchun; Xuan, XC (reprint author), Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA.
2017-06-01
发表期刊PHYSICS OF FLUIDS
卷号29期号:6
ISSN1070-6631
摘要Electrokinetic flow, due to a nearly plug-like velocity profile, is the preferred mode for transport of fluids (by electroosmosis) and species (by electrophoresis if charged) in microfluidic devices. Thus far there have been numerous studies on electrokinetic flow within a variety of microchannel structures. However, the fluid and species behaviors at the interface of the inlet reservoir (i.e., the well that supplies the fluid and species) and microchannel are still largely unexplored. This work presents a fundamental investigation of the induced charge effects on electrokinetic entry flow due to the polarization of dielectric corners at the inlet reservoir-microchannel junction. We use small tracing particles suspended in a low ionic concentration fluid to visualize the electrokinetic flow pattern in the absence of Joule heating effects. Particles are found to get trapped and concentrated inside a pair of counter-rotating fluid circulations near the corners of the channel entrance. We also develop a depth-averaged numerical model to understand the induced charge on the corner surfaces and simulate the resultant induced charge electroosmosis (ICEO) in the horizontal plane of the microchannel. The particle streaklines predicted from this model are compared with the experimental images of tracing particles, which shows a significantly better agreement than those from a regular two-dimensional model. This study indicates the strong influences of the top/bottom walls on ICEO in shallow microchannels, which have been neglected in previous two-dimensional models. Published by AIP Publishing.
DOI10.1063/1.4984741
收录类别SCI ; EI
语种英语
WOS记录号WOS:000404636900002
关键词[WOS]RESERVOIR-BASED DIELECTROPHORESIS ; ELECTROOSMOTIC FLOW ; AC ELECTROKINETICS ; ELECTRIC-FIELD ; FLUID-FLOW ; PARTICLES ; MICROCHANNELS ; ELECTROPHORESIS ; ELCTROOSMOSIS ; CELLS
WOS研究方向Mechanics ; Physics
WOS类目Mechanics ; Physics, Fluids & Plasmas
项目资助者NSF(CBET-1150670) ; University 111 Project of China(B08046) ; NSFC(11272321 ; Open Fund of LNM ; 11572334)
课题组名称LNM微纳米流体力学
论文分区一类/力学重要期刊
力学所作者排名4
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/60889
专题非线性力学国家重点实验室
通讯作者Xuan, XC (reprint author), Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA.
推荐引用方式
GB/T 7714
Prabhakaran, Rama Aravind,Zhou, Yilong,Zhao, Cunlu,et al. Induced charge effects on electrokinetic entry flow[J]. PHYSICS OF FLUIDS,2017,29(6).
APA Prabhakaran, Rama Aravind.,Zhou, Yilong.,Zhao, Cunlu.,胡国庆.,Song, Yongxin.,...&Xuan, XC .(2017).Induced charge effects on electrokinetic entry flow.PHYSICS OF FLUIDS,29(6).
MLA Prabhakaran, Rama Aravind,et al."Induced charge effects on electrokinetic entry flow".PHYSICS OF FLUIDS 29.6(2017).
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