|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
|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.|
|学科领域||Biochemistry & Molecular Biology
; ELECTRODELESS DIELECTROPHORESIS
; MICROFLUIDIC SYSTEMS
; PARTICLE SEPARATION
; AC ELECTROKINETICS
|WOS研究方向||Biochemistry & Molecular Biology
|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.
|通讯作者||Xuan, XC (reprint author), Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA|
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.
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.
Sridharan S,et al."Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis".Electrophoresis 32.17(2011):2274-2281.