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Subdynamic asymptotic behavior of microfluidic valves

Tesar, V., Tippetts, J.R., Allen, R.W.K. and Low, Y.Y. (2005) Subdynamic asymptotic behavior of microfluidic valves. Journal of Microelectromechanical Systems, 14 (2). pp. 335-347. ISSN 1057-7157

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Abstract

Decreasing the Reynolds number of microfluidic no-moving-part flow control valves considerably below the usual operating range leads to a distinct “subdynamic” regime of viscosity- dominated flow, usually entered through a clearly defined transition. In this regime, the dynamic effects on which the operation of large-scale no-moving-part fluidic valves is based, cease to be useful, but fluid may be driven through the valve (and any connected load) by an applied pressure difference, maintained by an external pressure regulator. Reynolds number ceases to characterize the valve operation, but the driving pressure effect is usefully characterized by a newly introduced dimensionless number and it is this parameter which determines the valve behavior. This summary paper presents information about the subdynamic regime using data (otherwise difficult to access) obtained for several recently developed flow control valves. The purely subdynamic regime is an extreme. Most present-day microfluidic valves are operated at higher Re, but the paper shows that the laws governing subdynamic flows provide relations useful as an asymptotic reference.

Item Type: Article
Copyright, Publisher and Additional Information: © 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Low Reynolds number, microfluidics, no-moving part valves
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Process Engineering (Sheffield)
Depositing User: Vaclav Tesar
Date Deposited: 20 May 2005
Last Modified: 08 Feb 2013 16:47
Status: Published
Refereed: Yes
Identification Number: 10.1109/JMEMS.2004.839348
URI: http://eprints.whiterose.ac.uk/id/eprint/469

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