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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.
Source PublicationPHYSICS OF FLUIDS
2017-06-01
Volume29Issue:6
ISSN1070-6631
AbstractElectrokinetic 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
Indexed BySCI ; EI
Language英语
WOS IDWOS:000404636900002
WOS KeywordRESERVOIR-BASED DIELECTROPHORESIS ; ELECTROOSMOTIC FLOW ; AC ELECTROKINETICS ; ELECTRIC-FIELD ; FLUID-FLOW ; PARTICLES ; MICROCHANNELS ; ELECTROPHORESIS ; ELCTROOSMOSIS ; CELLS
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding OrganizationNSF(CBET-1150670) ; University 111 Project of China(B08046) ; NSFC(11272321 ; Open Fund of LNM ; 11572334)
DepartmentLNM微纳米流体力学
Classification一类/力学重要期刊
Ranking4
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60889
Collection非线性力学国家重点实验室
Corresponding AuthorXuan, XC (reprint author), Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA.
Recommended Citation
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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