Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/82284
Title: Induced charge effects on electrokinetic entry flow
Authors: Prabhakaran, Rama Aravind
Zhou, Yilong
Zhao, Cunlu
Hu, Guoqing
Song, Yongxin
Wang, Junsheng
Yang, Chun
Xuan, Xiangchun
Keywords: Microscale flows
Electric fields
Issue Date: 2017
Source: Prabhakaran, R. A., Zhou, Y., Zhao, C., Hu, G., Song, Y., Wang, J., et al. (2017). Induced charge effects on electrokinetic entry flow. Physics of Fluids, 29(6), 062001-.
Series/Report no.: Physics of Fluids
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.
URI: https://hdl.handle.net/10356/82284
http://hdl.handle.net/10220/43527
ISSN: 1070-6631
DOI: 10.1063/1.4984741
Rights: © 2017 American Institute of Physics (AIP). This paper was published in Physics of Fluids and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: [http://dx.doi.org/10.1063/1.4984741]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

Files in This Item:
File Description SizeFormat 
Induced charge effects on electrokinetic entry flow.pdf16.35 MBAdobe PDFThumbnail
View/Open

SCOPUSTM   
Citations 10

25
Updated on Mar 10, 2021

PublonsTM
Citations 10

29
Updated on Mar 3, 2021

Page view(s)

191
Updated on May 21, 2022

Download(s) 50

95
Updated on May 21, 2022

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.