Letter | Published:

Distribution of Pressure for Flow of Gas through Porous Media

Nature volume 192, pages 12771278 (30 December 1961) | Download Citation



THE permeability coefficient K for flow of gas through a porous medium is defined by the equation1: where G is the flowing flux in moles through unit cross-sectional area of the medium in unit time, and ∂c/∂x is the concentration gradient. When the concentration of the gas is expressed in terms of the pressure p, equation (1) becomes: If K is a linear function of pressure: where a and b are constants, equation (2) may be integrated using the boundary conditions: p = pi (inlet pressure) at x = L; p = p0 (outlet pressure) at x = 0; p = f(x) 0 < x < L for all time.

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  1. 1.

    , Flow of Gases through Porous Media, 3 (Butterworths, London, 1956).

  2. 2.

    , Nature, 187, 865 (1960).

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  1. Department of Metallurgical and Chemical Engineering, University of Adelaide and South Australian Institute of Technology, Adelaide.

    • G. J. FIELD
    •  & H. WATTS


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