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- W2605853072 abstract "The object of this paper is to determine permeability behavior of coal seams with the depth of working places. Test pieces for the experiments are prepared by pressing coal particles into the cylinder of coal of 3cm in diameter and 4cm in length. Emphasis is placed on the effects of grain diameter and applied compressive load on the permeability of coal. The data obtained by flowing nitrogen gas through the coal are studied using capillaric model which may establish correlations between the permeability and the geometry of the porous structure. Principal results of this investigation are as follows.(1) The Klinkenberg's gas flow equation in terms of molecular slip is valid in the limited region.(2) The b factor in the Klinkenberg's equation is determined by the square root of the quotient of true permeability divided by porosity, √K∞/φ and the ratio of flow-path length to sample-path length, τ which has been named tortuosity.τ increases as the particle diameter decreases or compressed load increases, varying from 0.42-2.7. If ζ(=√K∞/φ+√1/τ) is defined as the new property of the porous materials, ζ can be provided as a exponential function of compressive load W, that is, ζ=ζ0eβW, where β is about -1.1, ζ0 is related with W linerly in log-log plots.(3) The smaller the particles of coal is, the greater the porosity becomes, but as the compressive load increases, the porosity and the pore radius decrease." @default.
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- W2605853072 date "1982-01-01" @default.
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- W2605853072 title "The Permeability of Coal Seams to Gas" @default.
- W2605853072 doi "https://doi.org/10.2473/shigentosozai1953.98.1127_15" @default.
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