By analyzing the three-dimensional digital model of a real carbon paper gas diffusion layer\n(GDL) reconstructed by X-ray computed tomography (CT), it was found that fibers are not distributed\nat any angle but within a certain range. The fiber orientation can be represented by fiber pitch (i.e., the\nangle between a single fiber and the in-plane direction). The effect of fiber orientation on stochastic\nreconstruction and transport properties (permeability) was investigated in this paper to find which\nfiber pitch range can achieve a better GDL on fluid flow. First, the actual fiber pitch was measured by\nanalyzing SGL-24BA images obtained by X-ray CT. Also, seven different ranges of fiber pitch were\nrandomly chosen to reconstruct GDL. Then, the permeability of these digital models was calculated\nusing the Lattice Bolzmann Method (LBM) and discussed to obtain the fiber pitch range of the optimal\npermeability...................
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