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Influence of Entrance and Exit Conditions on the Transient Evolution of Streaming Potential in a Finite Length Microchannel

[+] Author Affiliations
Ali Mansouri, Carl Scheuerman, Subir Bhattacharjee, Daniel Y. Kwok, Larry W. Kostiuk

University of Alberta, Edmonton, AB, Canada

Paper No. ICMM2005-75176, pp. 541-549; 9 pages
doi:10.1115/ICMM2005-75176
From:
  • ASME 3rd International Conference on Microchannels and Minichannels
  • ASME 3rd International Conference on Microchannels and Minichannels, Part B cont’d
  • Toronto, Ontario, Canada, June 13–15, 2005
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4185-5 | eISBN: 0-7918-3758-0
  • Copyright © 2005 by ASME

abstract

Microfluidic systems have profoundly transformed chemical analysis, separation and detection techniques over the past decade by enabling rapid manipulation of extremely small volumes of fluid. Electrokinetic (EK) flow, i.e., flow of an electrolyte in narrow capillaries driven by the combined influence of electric field and pressure, is of significant interest in microfluidic devices. Review of literature reveals that most studies on microchannels are either for steady state solution or infinite length microchannels. In this paper, we examine the development of a transient streaming potential for pressure-driven EK flow in a finite length microchannel. A transient numerical simulation of ion transport leading to the development of a streaming potential across a finite length circular cylindrical microchannel connecting two infinite reservoirs is presented. The solution based on finite element analysis shows the transient development of ionic fluxes, currents, and the streaming potential across the channel. The influence of the entrance and exit effects on the evolution of the streaming potential is clearly depicted in this study. Our results will be employed to discuss some of the limitations of literature streaming potential analysis based on infinite length microchannels.

Copyright © 2005 by ASME
Topics: Microchannels

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