An interdigitated cathode flow field was tested in-situ with neutron radiography to measure the water transport through the porous gas diffusion layer in a PEM fuel cell. Constant current density to open circuit cycles were tested and the resulting liquid water accumulation and dissipation rates with in-plane water distributions are correlated to measured pressure differential between inlet and outlet gas streams. The effect of varying reactant gas relative humidity on liquid water accumulation is also demonstrated. These results provide evidence that reactant gas establishes a consistent in-plane transport path through diffusion layer and liquid water accumulates as a result of decreased pressure in these regions.
Citation: International Journal of Heat and Mass Transfer
Pub Type: Journals
fuel cell, interdigitated, neutron radiography, visualization, water management