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Modeling and Visualizing Electroosmotic Microchannel Flow With Joule Heating Effects

[+] Author Affiliations
Xiangchun Xuan, Bo Xu, Dongqing Li

University of Toronto, Toronto, ON, Canada

David Sinton

University of Victoria, Victoria, BC, Canada

Paper No. ICMM2004-2417, pp. 817-823; 7 pages
  • ASME 2004 2nd International Conference on Microchannels and Minichannels
  • ASME 2nd International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, June 17–19, 2004
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4164-2
  • Copyright © 2004 by ASME


Electroosmotic flow with Joule heating effects was examined numerically and experimentally in a micro capillary. Fluorescence-based thermometry and velocimetry techniques were employed to visualize the liquid temperature and the electroosmotic velocity profile, respectively. Sharp temperature drops close to the two ends and a high-temperature plateau in the middle of the capillary were observed. Correspondingly, concave-convex-concave velocity profiles were observed in the inlet-middle-outlet regions of the homogeneous capillary. The measured liquid temperature distributions and electroosmotic velocity profiles along the capillary agree well with the predictions of a theoretical model developed in this paper.

Copyright © 2004 by ASME



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