AN ANALYTICAL MODEL FOR PORE AND TORTUOSITY FRACTAL DIMENSIONS OF POROUS MEDIA

Peng Xu, Zhenyu Chen, Shuxia Qiu, Mo Yang and Yanwei Liu
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Peng Xu: College of Science, China Jiliang University, Hangzhou 310018, P. R. China†State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, P. R. China
Zhenyu Chen: College of Science, China Jiliang University, Hangzhou 310018, P. R. China
Shuxia Qiu: College of Science, China Jiliang University, Hangzhou 310018, P. R. China‡School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
Mo Yang: ��School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
Yanwei Liu: ��State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, P. R. China

FRACTALS (fractals), 2021, vol. 29, issue 06, 1-10

Abstract: Accurate characterization of pore-scale structures of porous media is necessary for studying their transport mechanisms and properties. An analytical model for pore and capillary structures of porous media is developed based on fractal theory in this study. The pore and tortuosity fractal dimensions are introduced to characterize the pore size distribution and tortuous flow paths. A power law scaling between fractal probability function and pore diameter is proposed, which can be applied to determine the pore fractal dimension. The explicit expression for tortuosity fractal dimension is derived based on exactly self-similar fractal set and fractal capillary bundle model. The present fractal model has been validated by comparison with that of experiments and numerical simulations as well as theoretical models. The results show that the tortuosity fractal dimension decreases as porosity and pore fractal dimension increase, it increases with the increment of tortuosity. Both the particle shape and pore size range take important effect on the tortuosity fractal dimension under certain porosity. The proposed pore-scale model can present a conceptual tool to study the transport mechanisms of porous media and may provide useful guideline for oil and gas exploitation, hydraulic resource development, geotechnical engineering and chemical engineering.

Keywords: Porous Media; Pore Size Distribution; Tortuosity; Fractal Geometry; Fractal Dimension (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218348X21501565

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