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Mixing Enhancement by Induced-Charge Electrokinetic Flow

[+] Author Affiliations
Zhemin Wu, Dongqing Li

Vanderbilt University, Nashville, TN

Paper No. MNHT2008-52001, pp. 53-61; 9 pages
doi:10.1115/MNHT2008-52001
From:
  • ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer
  • ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B
  • Tainan, Taiwan, June 6–9, 2008
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4292-4 | eISBN: 0-7918-3813-7
  • Copyright © 2008 by ASME

abstract

The induced-charge electrokinetic flow (ICEKF) in a rectangular micorchannel with conducting hurdles embedded in the middle is investigated in this paper. A correction method is suggested to numerically estimate the induced zeta potential on the conducting surface. Two-dimensional pressure-linked Navior-Stokes equation is used to model the flow field in the channel. The numerical results show flow circulations generated from the induced non-uniform zeta potential distribution along the conducting hurdle surfaces. It is demonstrated numerically that the local flow circulations provide effective means to enhance the flow mixing between different solutions; the degree of enhancement depends on the hurdle geometries and hurdle numbers. The mixing using ICEKF described in this paper can be used in various microfluidics and lab-on-a-chip applications.

Copyright © 2008 by ASME
Topics: Flow (Dynamics)

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