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Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis
Sridharan S; Zhu JJ; Hu GQ(胡国庆); Xuan XC; Xuan, XC (reprint author), Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA
2011
发表期刊Electrophoresis
卷号32期号:17页码:2274-2281
ISSN0173-0835
摘要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.
关键词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
学科领域Biochemistry & Molecular Biology ; Chemistry
DOI10.1002/elps.201100011
URL查看原文
收录类别SCI
语种英语
WOS记录号WOS:000295216200005
关键词[WOS]ELECTRIC-FIELDS ; ELECTRODELESS DIELECTROPHORESIS ; MICROFLUIDIC SYSTEMS ; PARTICLE SEPARATION ; AC ELECTROKINETICS ; FLUID-FLOW ; CELLS ; MANIPULATION ; SIZE ; MICROCHANNELS
WOS研究方向Biochemistry & Molecular Biology ; Chemistry
WOS类目Biochemical Research Methods ; Chemistry, Analytical
项目资助者This work was supported by NSF under grant CBET-0853873 and by Clemson University through a start-up package (X. X.). The support from the Knowledge Innovation Program of CAS (KJCX2-YW-H18) (G. H.) is also gratefully appreciated.
课题组名称LNM微纳米流体力学
论文分区二类/Q1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/44910
专题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
Sridharan S,Zhu JJ,Hu GQ,et al. Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis[J]. Electrophoresis,2011,32(17):2274-2281.
APA Sridharan S,Zhu JJ,胡国庆,Xuan XC,&Xuan, XC .(2011).Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis.Electrophoresis,32(17),2274-2281.
MLA Sridharan S,et al."Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis".Electrophoresis 32.17(2011):2274-2281.
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