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Numerical Simulation of Hindered Diffusion in γ-Alumina Catalyst Supports
Abstract : By employing multi-scale random models of c-alumina, we have studied the influence of porosity, grain aspect ratio and aggregation state on the effective diffusion coefficient. Multi-scale Boolean models of platelets were used to produce digital volumes reproducing the alumina porous space. Iterative fast Fourier transform numerical simulation of Fick's diffusion were performed on the volume to obtain the effective diffusion coefficient. The tortuosity factors of the various simulated models show a simple dependence with pore volume fraction with an exponent guided by the platelet aspect ratio and the aggregation state. Comparisons with proton pulsed-field gradient nuclear magnetic resonance spectrometry show a satisfactory agreement.
https://hal.archives-ouvertes.fr/hal-01487954
Contributor : François Willot Connect in order to contact the contributor
Submitted on : Monday, March 13, 2017 - 11:43:37 AM
Last modification on : Monday, March 28, 2022 - 11:26:04 AM
Contributor : François Willot Connect in order to contact the contributor
Submitted on : Monday, March 13, 2017 - 11:43:37 AM
Last modification on : Monday, March 28, 2022 - 11:26:04 AM
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