Direct simulation of the influence of the pore structure on the diffusion process in porous media
Direct simulation of the influence of the pore structure on the diffusion process in porous media
复制标题
直接模拟多孔介质中孔隙结构对扩散过程的影响
DOI:
10.1016/j.camwa.2013.08.032
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发表时间:
2014-02
影响因子:
2.9
通讯作者:
Yin, Xiaolong
中科院分区:
文献类型:
--
作者:
Lou, Xiaojun;Li, Sha;Yang, Chao;Yin, Xiaolong
In this paper, we numerically study the influence of pore structures on diffusion processes in porous media. The porous media geometry models are constructed based on two-dimensional Voronoi diagrams, and they feature randomly connected channels with large pores embedded to simulate the heterogeneity of porous media. A link-type two-relaxation-time (LTRT) lattice Boltzmann (LB) method is employed to solve the diffusion equation. The tortuosity is characterized as a function of porosity and pore structure. From numerical results, a correlation for the tortuosity as a function of porosity is derived for Voronoi geometries without large pores. Geometries with large pores at the same total porosity have higher tortuosity, which indicates that geometric heterogeneity slows down the diffusion.
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