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- Title
Diffusion-filtration model of methane escape from a coal seam.
- Authors
Alexeev, A. D.; Vasilenko, T. A.; Gumennik, K. V.; Kalugina, N. A.; Feldman, E. P.
- Abstract
Methane desorption from a coal seam is theoretically investigated using a model including both the diffusion of methane in coal lumps and its filtration through net-shaped pores and cracks. The methane density distribution along the seam at an arbitrary time instant is found. Explicit dependences of the amount of the methane escaped from the seam on the lump size, open and closed porosity, viscosity and solubility of methane, and pressure and temperature in the seam are determined. An effective diffusion coefficient in lumps containing methane-filled closed pores is found. In the case of hindered diffusion, the methane can be subdivided into the “fast” and “slow” fractions.
- Subjects
METHANE; THERMAL desorption; DIFFUSION; POROSITY; VISCOSITY; COAL
- Publication
Technical Physics, 2007, Vol 52, Issue 4, p456
- ISSN
1063-7842
- Publication type
Article
- DOI
10.1134/S106378420704010X