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Title:
Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis
Author: Sridharan S; Zhu JJ; Hu GQ(胡国庆); Xuan XC
Source: Electrophoresis
Issued Date: 2011
Volume: 32, Issue:17, Pages:2274-2281
Abstract: Insulator-based dielectrophoresis (iDEP) is an emerging technology that has been successfully used to manipulate a variety of particles in microfluidic devices. However, due to the locally amplified electric field around the in-channel insulator, Joule heating often becomes an unavoidable issue that may disturb the electroosmotic flow and affect the particle motion. This work presents the first experimental study of Joule heating effects on electroosmotic flow in a typical iDEP device, e. g. a constriction microchannel, under DC-biased AC voltages. A numerical model is also developed to simulate the observed flow pattern by solving the coupled electric, energy, and fluid equations in a simplified two-dimensional geometry. It is observed that depending on the magnitude of the DC voltage, a pair of counter-rotating fluid circulations can occur at either the downstream end alone or each end of the channel constriction. Moreover, the pair at the downstream end appears larger in size than that at the upstream end due to DC electroosmotic flow. These fluid circulations, which are reasonably simulated by the numerical model, form as a result of the action of the electric field on Joule heating-induced fluid inhomogeneities in the constriction region.
Keyword: Electroosmotic Flow ; Electrothermal Flow ; Insulator-Based Dielectrophoresis ; Joule Heating ; Microfluidics ; Electric-Fields ; Electrodeless Dielectrophoresis ; Microfluidic Systems ; Particle Separation ; Ac Electrokinetics ; Fluid-Flow ; Cells ; Manipulation ; Size ; Microchannels
Language: 英语
Indexed Type: SCI
Corresponding Author: Xuan, XC (reprint author), Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA
Correspondent Email: xcxuan@clemson.edu
DOI: 10.1002/elps.201100011
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Biochemical Research Methods ; Chemistry, Analytical
WOS Subject Extended: Biochemistry & Molecular Biology ; Chemistry
WOS Keyword Plus: ELECTRIC-FIELDS ; ELECTRODELESS DIELECTROPHORESIS ; MICROFLUIDIC SYSTEMS ; PARTICLE SEPARATION ; AC ELECTROKINETICS ; FLUID-FLOW ; CELLS ; MANIPULATION ; SIZE ; MICROCHANNELS
WOS ID: WOS:000295216200005
ISSN: 0173-0835
Rank: [Sridharan, Sriram; Zhu, Junjie; Xuan, Xiangchun] Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA; [Hu, Guoqing] Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China
Subject: Biochemistry & Molecular Biology; Chemistry
Department: LNM微纳米流体力学
Classification: 二类/Q1
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/44910
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Sridharan S,Zhu JJ,Hu GQ,et al. Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis[J]. Electrophoresis,2011-01-01,32(17):2274-2281.
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