Induced charge effects on electrokinetic entry flow
文献类型：期刊论文
| 作者 | 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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| 刊名 | PHYSICS OF FLUIDS
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| 出版日期 | 2017-06-01 |
| 卷号 | 29期号:6 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/1.4984741 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | RESERVOIR-BASED DIELECTROPHORESIS ; ELECTROOSMOTIC FLOW ; AC ELECTROKINETICS ; ELECTRIC-FIELD ; FLUID-FLOW ; PARTICLES ; MICROCHANNELS ; ELECTROPHORESIS ; ELCTROOSMOSIS ; CELLS |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000404636900002 |
| 资助机构 | NSF(CBET-1150670) ; University 111 Project of China(B08046) ; NSFC(11272321 ; Open Fund of LNM ; 11572334) |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/60889]  |
| 专题 | 力学研究所_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). |
入库方式： OAI收割
来源：力学研究所
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