Numerical Investigation on Hydrogen Permeation with Flat Sheet Pd/Ag Membrane for Various Geometries

Abstract:

The variation in hydrogen concentration distribution on Pd/Ag membrane surface for permeation with H₂/N₂ mixture was investigated numerically, by varying the diameter of the mixture inlet. A 77wt.%Pd/23wt.%Ag purification membrane with thickness of 25μm and effective surface area of 3.14x10^-4m² was considered. The membrane temperature, total upstream pressure, and inlet H₂ mole fraction were set to 623K, 0.25MPa and 0.75, respectively. Meanwhile, the downstream pressure was set at atmospheric. Mean mole flux (feed flow rate/effective membrane surface area) was varied between 0.19-0.95 mol.s^-1.m^-2. The hydrogen concentration distribution was investigated for various ratios of inlet radius to membrane radius (0.22:1, 0.50:1 and 0.75:1). It is found that hydrogen permeation flux obtained from various hydrogen concentration distributions are almost same, and quantitatively fit with analytical result based on the Sieverts’ equation with the effect of H₂ permeation.

• Periodical: Applied Mechanics and Materials (Volume 819)
• Pages: 454-458
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.819.454
• Online since: January 2016
• Authors: Hasan Mohd Faizal*, Takeshi Yokomori, Toshihisa Ueda
• Keywords: Fuel Cell, Hydrogen, Pd/Ag Membrane, Reformer, Sieverts’ Equation

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