期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 42, 页码 22107-22121出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.04.039
关键词
Gas diffusion layer; Porosity gradient; Lattice Boltzmann method; Permeability; Tortuosity
资金
- National Natural Science Foundation of China [51779025, 52001045]
- Fundamental Research Funds for the Central Universities of China [3132019327]
- China Postdoctoral Science Foundation [2019M651097, 2019M651094]
- Natural Science Foundation of Liaoning Province [2019-BS-026, 2019ZD-0154, 2020-HYLH-38]
- Dalian City Innovative Support Program for High-Level Talents [2019RQ036]
In this paper, the lattice Boltzmann method was used to investigate the permeability and internal fluid behavior of the gas diffusion layer. It was found that a linear porosity gradient distribution resulted in higher permeability values compared to other types, and optimal porosity gradient distributions at specific porosities led to enhanced permeability.
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. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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