Citation

Jia H, An F, Peng X. China Saf. Sci. J. 2020; 30(2): 73-78.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.02.012

PMID

unavailable

Abstract

In order to study limitation of Barrel method in calculating gas diffusion coefficient of coal as an approximate solution of diffusion model, numerical calculation and theoretical approximation method for diffusion coefficient were adopted, and numerical and theoretical solutions of diffusion coefficient calculated through average concentration model and gas-bearing feature model were compared. Then, Barrel method was analyzed only considering gas content gradient but not influence of gas-bearing state on calculation accuracy of diffusion coefficient. The research shows that numerical solutions of Barrel method and time-varying coefficient method are basically consistent with theoretical solutions when average concentration model is applied while their calculation results will decline first and maintain a stable trend in case of gas-bearing characteristic model. Gas content gradient is a premise assumption of diffusion dynamics in a theoretical model, which causes calculated value of diffusion coefficient to be smaller than actual one. © 2020 China Safety Science Journal. All rights reserved.

Language: zh