Two-Phase Transport in Porous Gas Diffusion Electrodes

作者: S. Litster , N. Djilali

DOI: 10.2495/1-85312-840-6/05

关键词:

摘要: The accumulation of liquid water in electrodes can severely hinder the performance PEMFCs. accumulated reduces ability reactant gas to reach reaction zone. Current understanding phenomena involved is limited by inaccessibility PEMFC situ experimental measurements, and numerical models continue gain acceptance as an essential tool overcome this limitation. This Chapter provides a review transport PEM fuel cells physical characteristics such electrodes. draws from polymer electrolyte membrane cell literature well relevant variety fields. focus placed on two-phase flow regimes porous media, with discussion driving forces various regimes. Mathematical ranging complexity multi-fluid, mixture formulation, porosity correction are summarized. key parameters each model identified and, where possible, quantified, assessment capabilities, applicability simulations limitations provided for approach. needs characterization electrode materials employed PEMFCs also highlighted.

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