# [1]马强,陈振乾.分形多孔材料双尺度孔隙内气体脱附扩散过程数值模拟[J].东南大学学报(自然科学版),2015,45(4):728-733.[doi:10.3969/j.issn.1001-0505.2015.04.020] 　Ma Qiang,Chen Zhenqian.Numerical simulation of desorption and diffusion of gas in fractal porous materials with two-scale pores[J].Journal of Southeast University (Natural Science Edition),2015,45(4):728-733.[doi:10.3969/j.issn.1001-0505.2015.04.020] 点击复制 分形多孔材料双尺度孔隙内气体脱附扩散过程数值模拟() 分享到： var jiathis_config = { data_track_clickback: true };

45

2015年第4期

728-733

2015-07-20

## 文章信息/Info

Title:
Numerical simulation of desorption and diffusion of gas in fractal porous materials with two-scale pores

Author(s):
School of Energy and Environment, Southeast University, Nanjing 210096, China

Keywords:

TK124
DOI:
10.3969/j.issn.1001-0505.2015.04.020

Abstract:
The desorption and diffusion of gas in porous materials are investigated. Based on the structure characteristics of real porous materials, three-dimensional isotropic and anisotropic fractal porous materials which are composed of the macroscopic pores and solid matrix are reconstructed by the fractional Brownian motion model(FBM). A two-scale numerical model coupling with gas diffusion in the macroscopic pores and desorption/diffusion in the microscopic pores of solid matrix are established using the lattice Boltzmann method. The effects of adsorbing capacity in the microscopic pores and structure characteristics of porous materials on gas desorption/diffusion are examined. Results show that the migration rate of gas to macroscopic pores is reduced by the lower adsorbing capacity of microscopic pores, which leads to the decrease in the transient concentrations in macroscopic pores. In addition, for porous materials with different structure characteristics, with the increase in the Hurst exponent, effective diffusion coefficients increase and specific surface area decreases, which leads to the decrease in the transient concentrations in macroscopic pores.

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