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Near-wall scaling of the Navier-Stokes constitutive relations for accurate micro gas flow simulations

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Lockerby, Duncan A. and Reese, Jason M. (2007) Near-wall scaling of the Navier-Stokes constitutive relations for accurate micro gas flow simulations. In: 5th International Conference on Nanochannels, Microchannels, and Minichannels, Puebla, MEXICO, JUN 18-20, 2007. Published in: ICNMM2007: PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS pp. 357-363.

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Abstract

A new model is described for micro gas flows that combines a second-order slip boundary condition with a near-wall scaling of the Navier-Stokes constitutive relations. This scheme, which is easily implemented within a conventional CFD framework, is shown to be far more accurate than the conventional second-order slip model at predicting high Knudsen number micro Couette and Poiseuille flows. It is also of equivalent computational cost, and as such, represents a more attractive alternative to the conventional slip approach. It is also shown that the current model is capable of accurately predicting combined Couette/Poiseulle flows at a much higher Knudsen number than second-order slip conditions, which bodes well for the applicability of the scheme to more general configurations.

Item Type: Conference Item (UNSPECIFIED)
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology
Journal or Publication Title: ICNMM2007: PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS
Publisher: AMER SOC MECHANICAL ENGINEERS
ISBN: 978-0-7918-4272-X
Official Date: 2007
Number of Pages: 7
Page Range: pp. 357-363
Identification Number: 10.1115/ICNMM2007-30061
Publication Status: Published
Title of Event: 5th International Conference on Nanochannels, Microchannels, and Minichannels
Location of Event: Puebla, MEXICO
Date(s) of Event: JUN 18-20, 2007
URI: http://wrap.warwick.ac.uk/id/eprint/30945

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