Abstract
The paper describes the application of a mathematical model to describe gas drainage in coal seams. The mechanism of gas flow from coal is not very clear at present. It can either follow Darcy’s law or Fick’s law of diffusion. In the opinion of the authors, a the earlier stages where the gas pressure is high, Darcy’s law applies [8]. At later stages when gas pressure is stabilised, Fick’s law of diffusion is applicable. In this study, therefore, Fick’s law has been applied. Experimental techniques for measuring the system model parameters such as in situ gas pressure and Langmuir’s constants are described. The solutions have been applied in a field experiment to determine field diffusion parameters.
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