A pore-network model is developed to study numerically the transient flow of fluid through the gas diffusion layer (GDL) of the PEM fuel cell. It is shown that the agglomeration of water droplet on the interface of the GDL and catalyst layer occurs faster for the samples with smaller pore diameters and lower contents of the hydrophobic agent. The study suggests that analysis of the temporal response of the GDL is a useful tool to evaluate its performance against transporting liquids.

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