Simulation of multiphase multicomponent processes in PEM fuel cells
The development of new alternative power sources/supplies is an
important task nowadays. Polymer electrolyte membrane (PEM) fuel-cells
currently are intensively investigated and improved for applications.
This requires a profound understanding of the physical and
electrochemical processes elapsing in fuel cells. It has been found
that the kinetics of the oxygen reduction at the cathode
is a limiting factor for the performance of fuel-cells. The transport
of oxygen to the cathode through its porous diffusion layer occurs in
a predominantly diffusive manner. The generation of liquid water at
the cathode-site constrains this oxygen transport to the reaction
layer. Thus, an efficient water management in the cathode diffusion
layer is necessary to improve the performance of the fuel-cell.
In the seminar we present a multiphase multicomponent model originally
developed at LH2 for the simulation of non-isothermal multiphase processes
in the subsurface and the modifications necessary for modeling
multiphase processes in the diffusion layer of PEM fuel-cells.
The results of two studies one on the influence of capillary pressure and
another on the effect of different flow regimes on the system behavior will