| 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.
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| Source Publication | PHYSICS OF FLUIDS
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| 2017-06-01 | |
| Volume | 29Issue:6 |
| ISSN | 1070-6631 |
| Abstract | 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. |
| DOI | 10.1063/1.4984741 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000404636900002 |
| WOS Keyword | RESERVOIR-BASED DIELECTROPHORESIS ; ELECTROOSMOTIC FLOW ; AC ELECTROKINETICS ; ELECTRIC-FIELD ; FLUID-FLOW ; PARTICLES ; MICROCHANNELS ; ELECTROPHORESIS ; ELCTROOSMOSIS ; CELLS |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Organization | NSF(CBET-1150670) ; University 111 Project of China(B08046) ; NSFC(11272321 ; Open Fund of LNM ; 11572334) |
| Department | LNM微纳米流体力学 |
| Classification | 一类/力学重要期刊 |
| Ranking | 4 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/60889 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Xuan, 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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| JouArt-2017-097.pdf（16597KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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