Transport in the porous electrodes in SOFC’s

Today the new energy sources become more important, one of these are the fuel cells. There is lots of research in fuel cell technology, how to make them more efficient is one big question. Simulation and modeling of the fuel cells are often used in the research. New and better models are made to make the results more accurate, both for commercial codes and for other applications. This report shows how the transport in the porous media is simulated and what results can be found by that. NOMENCLATURE ci mass fraction of species i C total molar concentration Di,j binary diffusivities Di,k Knudsen diffusion coefficient for species i Di, mixture diffusivity of species i in the mixture e gas internal energy hi convective heat transfer coefficient of species i diffusive mass flux of species i keff effective thermal conductivity molar flux density of species i Nj molar fluxes of other species, from j to n p fluid pressure Srad energy due to radiation term Si,j additional species sources Se energy due to source term t layer thickness T reaction temperature V velocity V velocity vector Xi concentration of species i Greek Symbols ε porosity ρ fluid density ζ shear stress tensor of the fluid µ fluid viscosity κ permeabilit