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Knudsen layer for tracer gas diffusion
The Physics of Fluids, 1975The diffusion of a tracer gas from a plane, porous boundary into a steady, rarefied background is investigated using the BGK model to account for collisions between the tracer and the background molecules. In a limited region close to the central part of the wall the diffusion process is nearly one-dimensional, and the resulting kinetic diffusion ...
Ytrehus, T. +2 more
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Gas diffusion through differently structured gas diffusion layers of PEM fuel cells
International Journal of Hydrogen Energy, 2007Abstract Proton exchange membrane fuel cell (PEMFC) gas diffusion layers (GDLs) play important parts in diffusing gas, discharging liquid water, and conducting electricity, etc. When liquid water is discharged through GDL to gas channel, there will be some pores of GDLs occupied by liquid water.
Zhigang Zhan +4 more
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In-Plane Effective Diffusivity in PEMFC Gas Diffusion Layers
Transport in Porous Media, 2016The in-plane effective diffusion coefficients in gas diffusion layers typically used in fuel cell electrodes were measured as a function of compression and hydrophobic polymer loading. This method was based on the transient diffusion of oxygen from air into an initially nitrogen purged porous sample and has proven to be accurate, fast, and ...
Rinat R. Rashapov, Jeff T. Gostick
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Oxygen Diffusion Characteristics of Gas Diffusion Layers With Moisture
ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels, 2008The mass transfer characteristics of the gas diffusion layer (GDL) in a polymer electrolyte fuel cell (PEFC) are closely related to the performance. In this study, the oxygen diffusivity of paper and cloth type porous media, which are generally used as GDLs, were measured with respect to liquid water content, using experimental apparatus consisting of ...
Daigo Iwasaki +3 more
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Novel Gas Diffusion Layers with Patterned Wettability
ECS Meeting Abstracts, 2015Inside a polymer electrolyte fuel cell (PEFC), the water management is rather complex: on one hand, the membrane needs a certain hydration state in order to ensure a sufficient proton conductivity; on the other hand, excessive water leads to blocked gas pathways with increased mass transport losses.
Antoni Forner-Cuenca +4 more
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