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The Effect of Fiber Orientation on Stochastic Reconstruction and Permeability of a Carbon Paper Gas Diffusion Layer

1
School of Automotive Studies, Tongji University, Shanghai 201804, China
2
Research & Advanced Technology Dept., SAIC Motor Corporation Limited, Shanghai 201804, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(14), 2808; https://doi.org/10.3390/en12142808
Received: 25 June 2019 / Revised: 11 July 2019 / Accepted: 13 July 2019 / Published: 22 July 2019
(This article belongs to the Special Issue Latest Progress for Proton Exchange Membrane Fuel Cells)
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Abstract

By analyzing the three-dimensional digital model of a real carbon paper gas diffusion layer (GDL) reconstructed by X-ray computed tomography (CT), it was found that fibers are not distributed at any angle but within a certain range. The fiber orientation can be represented by fiber pitch (i.e., the angle between a single fiber and the in-plane direction). The effect of fiber orientation on stochastic reconstruction and transport properties (permeability) was investigated in this paper to find which fiber pitch range can achieve a better GDL on fluid flow. First, the actual fiber pitch was measured by analyzing SGL-24BA images obtained by X-ray CT. Also, seven different ranges of fiber pitch were randomly chosen to reconstruct GDL. Then, the permeability of these digital models was calculated using the Lattice Bolzmann Method (LBM) and discussed to obtain the fiber pitch range of the optimal permeability. The results show that the mean fiber pitch of SGL-24BA is 2.40° and the individual values are all less than 6°, also, the permeability of the through-plane direction increases gradually as the range of fiber pitch increases, which can be used for the structural design of carbon paper GDL. View Full-Text
Keywords: carbon paper gas diffusion layer; fiber pitch; X-ray CT; stochastic reconstruction; permeability carbon paper gas diffusion layer; fiber pitch; X-ray CT; stochastic reconstruction; permeability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gao, Y.; Jin, T.; Wu, X.; Zhang, T. The Effect of Fiber Orientation on Stochastic Reconstruction and Permeability of a Carbon Paper Gas Diffusion Layer. Energies 2019, 12, 2808.

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