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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: ICNMM2007: 5th International Conference on Nanochannels, Microchannels, and Minichannels, Puebla, Mexico, 18-20 Jun 2007. Published in: Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007 pp. 357-363. ISBN 978079184272X. doi:10.1115/ICNMM2007-30061

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Official URL: http://dx.doi.org/10.1115/ICNMM2007-30061

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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 (Paper)
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007
Publisher: American Society for Chemical Engineers
ISBN: 978079184272X
Official Date: 2007
Dates:
DateEvent
2007UNSPECIFIED
Number of Pages: 7
Page Range: pp. 357-363
DOI: 10.1115/ICNMM2007-30061
Status: Peer Reviewed
Publication Status: Published
Conference Paper Type: Paper
Title of Event: ICNMM2007: 5th International Conference on Nanochannels, Microchannels, and Minichannels
Type of Event: Conference
Location of Event: Puebla, Mexico
Date(s) of Event: 18-20 Jun 2007

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