炭層からのガス流出量の関数表示と実験的考察
1972 年 88 巻 1015 号 p. 527-532
詳細
1972 年 88 巻 1015 号 p. 527-532
In order to improve the technique on the gas drainage in coal mines, the authors have carried out theoretically the studies on the unsteady gas flow caused by making a plain or a cylindrical free face in the porous media.
Present paper describes that more acculate numerical analysis are applied on the similer gas flow through coal seams which are capable of adsorbing much methane gas and the relations with the rate of flow of gas under various conditions are formularized. It is found that the rate of flow of gas, in the case of a plain free face, is proportional to the 1.3th power of the containing gas pressure and to the square root of the permeability and the time elapsed, and in the case of a cylindrical free face, it is proportional to the square of the pressure and to the parmeability and the time elapsed.
For the purpose of confirmation of the above analysis, experiment is carried out on the gas flow through the porous media consisting of plaster, sand and activated carbon instead of coal, and the experimental results agree fairly with the theoretical analysis.
