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Proceedings Paper

Irrotationality of uniform electro-osmosis
Author(s): Eric B. Cummings; Stewart K. Griffiths; Robert H. Nilson
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Paper Abstract

Steady electroosmotic flow of uniform liquids in uniform media is irrotational provided the electric double layers adjacent to surfaces are negligibly thin, the surfaces are non-conducting and impermeable, and the total pressure imposed at inlets and outlets is uniform. Because many microfluidic devices employing electroosmosis approximately satisfy these requirements, this ideal electrosmosis is a limiting case with considerable practical significance. In ideal electroosmosis, fluid motion follows current lines. Flow-fields have no Reynolds number dependence and are everywhere proportional to the electric field. Both fields may be obtained by a single solution of the Laplace equation. In this paper, we discuss these features of ideal electroosmotic flows and present particle-image derived velocity fields that confirm ideal flow conditions in glass microchannel networks.

Paper Details

Date Published: 19 August 1999
PDF: 10 pages
Proc. SPIE 3877, Microfluidic Devices and Systems II, (19 August 1999); doi: 10.1117/12.359336
Show Author Affiliations
Eric B. Cummings, Sandia National Labs. (United States)
Stewart K. Griffiths, Sandia National Labs. (United States)
Robert H. Nilson, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 3877:
Microfluidic Devices and Systems II
Chong Hyuk Ahn; A. Bruno Frazier, Editor(s)

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