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Title
| - Ignition and Front Propagation in Polymer Electrolyte Membrane Fuel Cells
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Abstract
| - Water produced in a polymer electrolyte membrane (PEM) fuel cell enhances membrane proton conductivity;this positive feedback loop can lead to current ignition. Gas-phase convection and membrane diffusion ofwater coupled with water production in a simplified two-dimensional PEM fuel cell leads to localized ignitionand current density front propagation in the cell. Co-current gas flow in the anode and cathode channelscauses ignition at the cell outlet, and membrane diffusion causes the front to slowly propagate toward theinlet; counter-current flow in the anode and cathode channels causes ignition in the interior of the cell, withthe current density fronts subsequently spreading toward both inlets. The basic chemistry and physics of thespatiotemporal nonlinear dynamics of the two-dimensional fuel cell current can be captured by extending asimple one-dimensional stirred tank reactor model to a “tanks-in-series” model.
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