A diffusivity model for gas diffusion through fractal porous media |
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Authors: | Qian Zheng Boming Yu Shifang Wang Liang Luo |
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Affiliation: | School of Physics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, PR China |
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Abstract: | 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. |
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