Numerical study on permeability of gas diffusion layer with porosity gradient using lattice Boltzmann method |
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Authors: | Hao Wang Guogang Yang Shian Li Qiuwan Shen Jiadong Liao Ziheng Jiang Mayken Espinoza-Andaluz Fengmin Su Xinxiang Pan |
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Affiliation: | 1. Marine Engineering College, Dalian Maritime University, Dalian 116026, China;2. Centro de Energías Renovables y Alternatives, Facultad de Ingeniería Mecánica y Ciencias de La Producción, Escuela Superior Politécnica Del Litoral (ESPOL), Guayaquil, Ecuador |
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Abstract: | In this paper, the lattice Boltzmann method (LBM) has been employed to explore the permeability and internal fluid flow behavior of the gas diffusion layer (GDL). Three different non-uniform porosity distributions are designed as linear type, stepped type, and transitional type and compared with constant porosity samples. Results show that the linear porosity gradient distribution leads to higher permeability values compared with the other two types. For samples with total porosity of 0.65 and 0.75, optimal porosity gradient distributions bring about an enhancement of permeability have been found. The impact of porosity gradient distribution on the velocity field is presented. Dependencies of permeability with porosity and tortuosity are demonstrated through several fitted equations. |
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Keywords: | Gas diffusion layer Porosity gradient Lattice Boltzmann method Permeability Tortuosity |
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