X-ray Computed Tomography of Gas Diffusion Layers of PEM Fuel Cells - Calculation of Thermal Conductivity
Three commercially available gas diffusion layers were investigated by 3D X-ray computed tomography (CT). The carbon fibers and the 3D structure of the gas diffusion layers were clearly resolved by this lab-based technique.
Based on 3D structures reconstructed from tomography data, the macroscopic, anisotropic effective thermal conductivities of the gas diffusion layers were calculated by solving the energy equation considering a pure thermal conduction problem. The average in-plane thermal conductivity for all samples, the carbon cloth and the two carbon papers, is by about a factor 4-12 larger than the average through-plane thermal conductivity. Furthermore, a clear dependence of thermal conductivity on the porosity and - especially for the carbon cloth - also on the local orientation of the fibers was observed.
PFRANG Andreas;
VEYRET Damien;
SIEKER Frank;
TSOTRIDIS Georgios;
2010-04-13
PERGAMON-ELSEVIER SCIENCE LTD
JRC55971
0360-3199,
www.elsevier.com/locate/he,
https://publications.jrc.ec.europa.eu/repository/handle/JRC55971,
10.1016/j.ijhydene.2010.01.085,
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