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Membranes 2017, 7(4), 58; https://doi.org/10.3390/membranes7040058

Comparison of the Simplification of the Pressure Profiles Solving the Binary Friction Model for Asymmetric Membranes

1
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, D-52428 Jülich, Germany
2
JARA-Energy, Jülich Aachen Research Alliance
*
Author to whom correspondence should be addressed.
Received: 18 August 2017 / Revised: 21 September 2017 / Accepted: 26 September 2017 / Published: 3 October 2017
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Abstract

The gas flow through porous media including that of multiple species is frequently described by the binary friction model (BFM) considering the binary diffusion, Knudsen diffusion, and viscous flow. Therefore, a numerical simulation was performed on a microporous support of an asymmetric oxygen transport membrane. As its exact numerical solution is complicated and not always possible, the results of two different levels of simplification of the pressure profiles within the porous support are compared to the exact numerical solution. The simplification using a constant pressure equal to the gas pressure outside the support leads to a deviation by up to 0.45 mL·min−1·cm−2 from the exact solution under certain operating condition. A different simplification using a constant pressure averaged between the outside of the support and the support/membrane interface reduces this deviation to zero. Therefore, this is a useful measure to reduce computational efforts when implementing the Binary Friction Model in computational fluid dynamics simulations. View Full-Text
Keywords: binary friction model; oxygen transport membrane; porous structure; MIEC; micro porous media; CFD binary friction model; oxygen transport membrane; porous structure; MIEC; micro porous media; CFD
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Unije, U.V.; Mücke, R.; Baumann, S.; Guillon, O. Comparison of the Simplification of the Pressure Profiles Solving the Binary Friction Model for Asymmetric Membranes. Membranes 2017, 7, 58.

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