Electrokinetic generation of microvortex patterns in a microchannel liquid flow

Alex Siu Wai Ng, Winky Lap Wing Hau, Yi Kuen Lee, Yitshak Zohar

Research output: Contribution to journalArticle

21 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)247-255
Number of pages9
JournalJournal of Micromechanics and Microengineering
Volume14
Issue number2
DOIs
StatePublished - Feb 2004
Externally publishedYes

Fingerprint

liquid flow
electrokinetics
Surface charge
microchannels
Microchannels
Liquids
Charge distribution
charge flow devices
Vorticity
microbalances
vorticity
charge distribution
Computational fluid dynamics
counters
Vortex flow
Electric fields
methodology
vortices
electric fields

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)
  • Mechanics of Materials
  • Computational Mechanics

Cite this

Electrokinetic generation of microvortex patterns in a microchannel liquid flow. / Ng, Alex Siu Wai; Hau, Winky Lap Wing; Lee, Yi Kuen; Zohar, Yitshak.

In: Journal of Micromechanics and Microengineering, Vol. 14, No. 2, 02.2004, p. 247-255.

Research output: Contribution to journalArticle

Ng, Alex Siu Wai ; Hau, Winky Lap Wing ; Lee, Yi Kuen ; Zohar, Yitshak. / Electrokinetic generation of microvortex patterns in a microchannel liquid flow. In: Journal of Micromechanics and Microengineering. 2004 ; Vol. 14, No. 2. pp. 247-255.
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