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Water transport in gas diffusion layers of PEM fuels cells in presence of a temperature gradient. Condensation effect.

Straubhaar, Benjamin and Prat, Marc Water transport in gas diffusion layers of PEM fuels cells in presence of a temperature gradient. Condensation effect. (2014) In: 20th World Hydrogen Energy Conference, 15 June 2014 - 20 June 2014 (Gwangju, Korea, Republic Of). (Unpublished)

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Abstract

The gas diffusion layers (GDL) are crucial components as regards the water management in proton exchange membrane fuel cells. The present work aims at clarifying the mechanisms of water transport in GDL on the cathode side using pore network simulations. Various transport scenarios are considered from pure diffusive transport in gaseous phase to transport in liquid phase with or without liquid-vapor phase change. A somewhat novel aspect lies in the consideration of condensation and evaporation processes in the presence of a temperature gradient across the GDL. The effect of thermal gradient was overlooked in previous works. The temperature gradient notably leads to the possibility of condensation because of the existence of a colder zone on the channel side. The pore network simulations lead to phase distributions in qualitative agreement with X-Ray tomography visualizations. The simulations also indicate that the probability of GDL water flooding increases with the distance from the bipolar plate channel inlet.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Benjamin STRAUBHAAR
Deposited On:27 Oct 2014 13:04

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