|Title:||Numerical modeling of the two-phase transport in a PEM fuel cell|
|Authors :||Safa, Yasser|
Schumacher, Jürgen O.
|Published in :||Proceedings of the Third European Fuel Cell Technology & Applications Conference : presented at 3rd European Fuel Cell Technology and Applications Conference, December 15 - 18, 2009, Rome, Italy|
|Conference details:||EFC2009 : European Fuel Cell Technology & Applications Piero Lunghi Conference, Rome, Italy, 15 - 18 December 2009|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Not specified|
|Subjects :||Fuel cell; Proton exchange membrane; Two-phase model; Numerical simulation|
|Subject (DDC) :||621.3: Electrical engineering and electronics|
|Abstract:||Under condensing conditions, liquid water occupies partially the void in the porous structures of Proton exchange membrane (PEM) fuel cells, and thus changes the transport properties for momentum, charge and species. Consequently, an accurate numerical prediction of the water distribution at different operating conditions is highly needed. An advanced two-phase flow model describing the water transport in PEM fuel cells is studied. To include the effects of vapor bubbles merged with the liquid droplets in the water flow the so called Multi-phase Mixture formalism is applied. A time-dependent model of a convection-diffusion equation for the water saturation and of the Darcy-law is numerically solved with assuming incompressibility condition for the fluid flow. Due to a degeneracy of the equations, the transport coefficients are perturbed to obtain a non-degenerate problem with smooth solution. The regularized solution converge to the original as the perturbation parameter goes to zero with a specific convergence rate. A stabilized finite element approximation (SUPG) is applied to solve in space the regularized saturation transport problem. It is combined with a stabilized mixed finite element discretization of Darcy problem for solving simultaneously for velocity, pressure and water saturation. The time discretization of the global system is applied via an implicit scheme. Since the time scale of the total flow is longer than that of the water saturation evolution, a multi-time step discretization is introduced. The numerical model is implemented in Mathematica 7.|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Computational Physics (ICP)|
|Publication type:||Conference Other|
|Appears in Collections:||Publikationen School of Engineering|
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