Determination of effective water vapor diffusion coefficient in pemfc gas diffusion layers
نویسندگان
چکیده
منابع مشابه
Determination of effective water vapor diffusion coefficient in pemfc gas diffusion layers
The primary removal of product water in proton exchange membrane (PEM) fuel cells is through the cathode gas diffusion layer (GDL) which necessitates the understanding of vapor and liquid transport of water through porous media. In this investigation, the effect of microporous layer (MPL) coatings, GDL thickness, and polytetrafluorethylene (PTFE) loading on the effective water vapor diffusion c...
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Polymer electrolyte membrane fuel cells (PEMFCs) directly convert the chemical energy of the reactants into electrical energy and usually consist of a proton exchange membrane (PEM) sandwiched between two catalyst layers (CLs), two porous gas diffusion layers (GDLs) often coated with a microporous layer (MPL) on the CL side, and two bipolar plates with embedded gas channels. Protons and electro...
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This paper explores the mathematical formulations of Fick and MaxwellStefan diffusion in the context of polymer electrolyte membrane fuel cell cathode gas diffusion layers. Formulations of diffusion combined with mass-averaged Darcy flow are considered for three component gases. Fick formulations can be considered as approximations of Maxwell-Stefan in a certain sense. For this application, the...
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Accurate information on the temperature field and associated heat transfer rates are particularly important in devising appropriate heat and water anagement strategies in proton exchange membrane (PEM) fuel cells. An important parameter in fuel cell performance analysis is the effective hermal conductivity of the gas diffusion layer (GDL). Estimation of the effective thermal conductivity is com...
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little attention has been paid to the geometrical parameters of Gas Diffusion Layers (GDLs), as many researchers have reported the GDL transport properties, like thermal conductivity, as a function of only one parameter; porosity. In this paper, a statistical unit cell approach is presented for estimation of the thermal conductivity on the basis of measured geometrical data such as the angles a...
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ژورنال
عنوان ژورنال: International Journal of Hydrogen Energy
سال: 2011
ISSN: 0360-3199
DOI: 10.1016/j.ijhydene.2011.01.036