To mitigate potential freeze-damage, enhance durability and cold start performance of polymer electrolyte fuel cell (PEFC), residual water in the fuel cell components must be minimized. Ideally, we would like to achieve complete liquid removal with minimal parasitic losses. A transient two-phase mathematical model has been formulated to predict the water redistribution in the fuel cell components, after the PEFC shutdown. The novel feature of the model is inclusion of a directly measured thermo-osmosis relationship in the electrolyte membrane, and also the phase change related transport (heat-pipe effect) in the porous media. A preliminary scale analysis found that thermo-osmotic flux in the membrane is almost same order of magnitude of diffusion flux and the heat pipe effect can enhance the thermal transport out of the porous media by 200-300%. Ultimately, this model will be used as a tool to help understand and minimize the residual water saturation in the fuel cell components under different shutdown conditions.
|Title of host publication||ECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting|
|Number of pages||13|
|State||Published - 1 Dec 2008|
|Event||Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting - Phoenix, AZ, United States|
Duration: 18 May 2009 → 23 May 2009
|Other||Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting|
|Period||18/05/09 → 23/05/09|