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Title: Electrokinetic generation of microvortex patterns in a microchannel liquid flow
Authors: Ng, Alex Sin Wai
Hau, Winky Lap Wing
Lee, Yi-Kuen
Zohar, Yitshak
Keywords: Microvortex
Electroosmotic flow
Surface charge patterning
Issue Date: Feb-2004
Citation: Journal of micromechanics and microengineering, v. 14, no. 2, Feb. 2004, p. 247-255
Abstract: The technology developed for micropatterning the electric surface charge to be negative, positive or neutral enables the realization of complex liquid flows in simple microchannels. A commercial CFD code is utilized to numerically simulate a variety of electrokinetically-generated liquid flows in a straight and uniform microchannel due to non-uniform surface charge distribution under an externally applied, steady electric field. We present design methodologies to electrokinetically drive vortical flows in any desired direction. In particular, we investigate surface charge patterns required to generate single or multi, co-rotating or counter-rotating, in-plane or out-of-plane vortices. Finally, in view of its potential application to microscale mixing, we discuss a surface charge pattern that can give rise to streamwise vorticity.
Rights: Journal of micromechanics and microengineering © Copyright (2004) IOP Publishing Ltd. The Journal's web site is located at
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