A diffusivity model for gas diffusion through fractal porous media

被引：124
|
作者：
Zheng, Qian [1 ]
Yu, Boming [1 ]
Wang, Shifang [1 ]
Luo, Liang [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China
来源：
CHEMICAL ENGINEERING SCIENCE | 2012年 / 68卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Gases; Diffusion; Fractals; Mass transfer; Porous media; Microstructure; THERMAL-CONDUCTIVITY; ANOMALOUS DIFFUSION; PERMEABILITY MODEL; TORTUOSITY; CHARACTERS;
D O I：
10.1016/j.ces.2011.10.031
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A fractal model for gas diffusivity in porous media is derived by using fractal theory and by considering rarefied gas effect in micro-/nano-channels/capillaries. The proposed gas diffusivity model is expressed as a function of micro-structural parameters (the fractal dimensions for pore area and for tortuosity of tortuous capillaries, porosity and pore sizes) of porous media. The effects of parameters such as porosity, microstructures of porous media and fractal dimensions on gas diffusivity are analyzed. The effective diffusivities predicted by the present fractal model are compared with the available experimental data, and a fair agreement between them is found when porosity is less than about 0.70. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：650 / 655
页数：6
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