Diffusion Mechanism of Porous Gases in Coal Seams
HE Xue-Qiu
NIE Bai-sheng
Abstract：Diffusion modes and micro-mechanism of gases in coal were analyzed. It is pointed out that in coalseams there are the following diffusion modes: Fick diffusion, Knudsen diffusion, transitional diffusion, sur-face diffusion and crystal diffusion. Moreover, the movement and diffusion processes of gas in coal seamsduring the drainage were described. The effect rules of pressure and temperature on the mean molecule freepath of gas were discussed in microcosm according to molecule dynamics. Besides, the micro-mechanism ofenhancing the diffusion ability of porous gases by increasing pressure and temperature was explained. On thebasis of the relationship between the diffusion coefficients and the mean free path of gas molecules, it is foundthat the macro-parameters of gas diffusion is determined all by the micro-parameters of gas molecules.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1-4 )