Three-dimensional simulations of transient response of PEM fuel cells

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Yeşilyurt, Serhat (2007) Three-dimensional simulations of transient response of PEM fuel cells. In: 2007 ASME International Mechanical Engineering Congress and Exhibition, Seattle, Washington, USA

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Abstract

Transients have utmost importance in the lifetime and performance degradation of PEM fuel cells. Recent studies show that cyclic transients can induce hygro-thermal fatigue. In particular, the amount of water in the membrane varies significantly during transients, and determines the ionic conductivity and the structural properties of the membrane. In this work, we present three-dimensional time-dependent simulations and analysis of the transport in PEM fuel cells. U-sections of anode and cathode serpentine flow channels, anode and cathode gas diffusion layers, and the membrane sandwiched between them are modeled using incompressible Navier-Stokes equations in the gas flow channels, Maxwell-Stefan equations in the channels and gas diffusion layers, advection-diffusion-type equation for water transport in the membrane and Ohm’s law for ionic currents in the membrane and electric currents in gas diffusion electrodes. Transient responses to step changes in load, pressure and the relative humidity of the cathode are obtained from simulations, which are conducted by means of a third party finite-element package, COMSOL.
Item Type: Papers in Conference Proceedings
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Serhat Yeşilyurt
Date Deposited: 26 Nov 2007 11:02
Last Modified: 26 Apr 2022 08:44
URI: https://research.sabanciuniv.edu/id/eprint/7215

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