| Time: |
May 19, 2011 |
| Lecturer: |
Dipl.-Phys. Manuel Huber
Insitut für Chemische Verfahrenstechnik, Universität Stuttgart |
| Venue: |
Pfaffenwaldring 61, Raum U1.003 (MML), Universität Stuttgart
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| Download as iCal: |
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Water management is one of the key problems with respect to the optimaloperation of PEM fuel cells.The physical transport processes that occur inside the gas diffusion layer(GDL) are already known from an experimental, macroscopic point of view anddescribed by empirical equations, where there is a need of volume averagingparameters like permeability.With the presented method it is possible to get rid of these volume averagingparameters by considering the underlying microscopic system with itsgeometry and properties of the porous structure.The aim is to shed light on processes in the microscale to obtain information ofthe local fluid behaviour and in this manner to determine these empiricalparameters, which can be used in other macroscopic simulations of largerdomain sizes. In this way measured and derived correlations for REV-basedquantities could be verified by this method.This approach shows how particle-based simulations can be used to describethe flow in the GDL of PEM fuel cells with randomly generated distributions offibres serving as interface positions where boundary conditions are introduced.The flow in a 2-dimensional cross-section of a GDL is shown with no-slipboundary conditions and as a further state of development an implementationof free surfaces and surface tension into the SPH formalism with a verificationof an oscillating drop is shown.
