Details

Autor(en) / Beteiligte

• Zhiqiang LI
• Jinsheng CHEN
• Lin LI
• Jiansong PENG

Titel

Experiment, modelling, mechanism and significance of multiscale and dynamic diffusion-permeability of gas through micro-nano series pores in coal

Ist Teil von

• Méitàn xuébào, 2023-04, Vol.48 (4), p.1551-1566

Ort / Verlag

Editorial Office of Journal of China Coal Society

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek - Freely accessible e-journals

Beschreibungen/Notizen

• As one of the hot issues at the frontiers of science in the world, the multi-scale scientific question has occurred in the fields of natural science and engineering. The seepage in coal-rock, a branch of the multi-scale science, shows its multi-scale scientific question. Coal is a porous medium that contains multi-scale pores with the aperture from millimeter to nanometer. The pore size differential can reach one million orders of magnitude, which causes the multi-scale characteristics in space and time for coal permeability. Therefore, the research on the multi-scale permeability of coal is a critical scientific issue of the coal gas flow as well as an engineering extension of methane drainage. The unsteady diffusion-seepage experiment is conducted for CH4/He with and without stress using a cylindrical coal sample, accompanied by steady state seepage experiment. The experimental results show that the apparent diffusion coefficient of a cylindrical coal sample attenuates with time. This apparent diffusion coe