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Title: A numerical study of structural change and anisotropic permeability in compressed carbon cloth polymer electrolyte fuel cell gas diffusion layers
Authors: Rama, Pratap
Liu, Yu
Chen, Rui
Ostadi, Hossein
Jiang, Kyle
Gao, Yuan
Zhang, Xiaoxian
Brivio, Davide
Grassini, Paolo
Keywords: D3Q19
GDL
Lattice Boltzmann
PDMS
PEFC
Permeability
Porous Network
Carbon cloth
Pore size distribution
Tortuosity
Degree of anisotropy
Issue Date: 2011
Publisher: © WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation: RAMA, P. ... et al, 2011. A numerical study of structural change and anisotropic permeability in compressed carbon cloth polymer electrolyte fuel cell gas diffusion layers. Fuel Cells, 11 (2), pp.274-285.
Abstract: The effect of compression on the actual structure and transport properties of the carbon cloth gas diffusion layer (GDL) of a polymer electrolyte fuel cell (PEFC) are studied here. Structural features of GDL samples compressed in the 0.0 – 100.0 MPa range are encapsulated using polydimethylsiloxane (PDMS) and by employing X-ray micro-tomography to reconstruct direct digital 3D models. Pore size distribution (PSD) and porosity data are acquired directly from these models while permeability, degree of anisotropy and tortuosity are determined through lattice Boltzmann (LB) numerical modelling. The structural models reveal that structural change proceeds through a three-step process, while PSD data suggests a characteristic peak in the pore diameter of 10-14 microns and a decrease in the mean pore diameter from 33 to 12 microns over the range of tested pressures. A mathematical relationship between compression pressure and permeability is determined based on the Kozeny-Carman equation, revealing a one order of magnitude reduction in through-plane permeability for a two order of magnitude increase in pressure. The results also reveal that the degree of anisotropy peaks in the 0.3 – 10.0 MPa range, suggesting that in-plane permeability can be maximised relative to through-plane permeability within a material-specific range of compression pressures.
Description: This article is closed access.
Version: Closed access
DOI: 10.1002/fuce.201000037
URI: https://dspace.lboro.ac.uk/2134/10530
Publisher Link: http://dx.doi.org/10.1002/fuce.201000037
ISSN: 1615-6846
Appears in Collections:Closed Access (Aeronautical and Automotive Engineering)

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