Gas flow in a permeable medium

The dynamics of gases in permeable media is approached both experimentally and by numerical simulations. The experiments were performed in matrices made of packed beds of spheres in rarefied conditions and a model for the direct simulation of the molecular kinetics is proposed. Comparisons between e...

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Bibliographic Details
Published in:Journal of fluid mechanics 2006-06, Vol.557, p.119-133
Main Authors: DE SOCIO, L. M., MARINO, L.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Flows through porous media
Fluid dynamics
Fluid mechanics
Fundamental areas of phenomenology (including applications)
Nonhomogeneous flows
Packed beds
Physics
Rarefied gas dynamics
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Summary:The dynamics of gases in permeable media is approached both experimentally and by numerical simulations. The experiments were performed in matrices made of packed beds of spheres in rarefied conditions and a model for the direct simulation of the molecular kinetics is proposed. Comparisons between experimental data and numerical results show the influence of the main parameters of the gas–solid interaction and the range of validity of the model. Moreover it is shown that there is a flow condition for the minimum permeability of the medium to the gas flow. Such a minimum depends upon the Knudsen number, and can be explained by the molecular dynamics as in the well-known Knudsen's experiment on capillaries.
ISSN:0022-1120
1469-7645
DOI:10.1017/S0022112006009621