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A procedure for calculating wall distance in arbitrary geometrics

Scanlon, T.J. and Reese, J.M. and O'Hare, L. (2006) A procedure for calculating wall distance in arbitrary geometrics. In: Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels. ASME, p. 96037. ISBN 0791837785

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Abstract

Paper describing a procedure for calculating wall distance in arbitrary geometrics. Methods for simulating the critical near-wall region in hydrodynamic models of gas micro-flows are discussed. Two important non-equilibrium flow features - velocity slip at solid walls, and the Knudsen layer (which extends one or two molecular mean free paths into the gas from a surface) - are investigated using different modelling approaches. In addition to a discussion of Maxwell's slip boundary condition, a newly implemented 'wall-function' model that has been developed to improve hydrodynamic simulations of the Knudsen layer is described. Phenomenological methods are compared to physical modelling and it is shown that, while both simulation types have merit, and both can quantitatively improve results in most cases, there are drawbacks associated with each approach. Phenomenological techniques, for example, may not be sufficiently general, whilst issues with applicability and stability are known to exist in some physical models.

Item type: Book Section
ID code: 6567
Keywords: geometrics, building design, construction engineering, fluid mechanics, thermodynamics, Mechanical engineering and machinery
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Faculty of Engineering > Design, Manufacture and Engineering Management
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Depositing user: Strathprints Administrator
Date Deposited: 07 Aug 2008
Last modified: 12 Mar 2012 10:45
URI: http://strathprints.strath.ac.uk/id/eprint/6567

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