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Lateral solid mixing in gas-fluidized beds: CFD and DEM studies

Oke, O; van Wachem, B; Mazzei, L; (2016) Lateral solid mixing in gas-fluidized beds: CFD and DEM studies. Chemical Engineering Research and Design , 114 pp. 148-161. 10.1016/j.cherd.2016.08.014. Green open access

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Abstract

We investigated lateral solid mixing in gas-fluidized beds using CFD and DEM. We ran 3D CFD simulations, comparing the results with those formerly obtained in 2D CFD simulations. We observed that the frictional stress model affects the numerical results. This was also observed in 2D simulations, but in 3D simulations the effect is less pronounced. The 3D simulations described the lateral solid mixing process more accurately than the 2D simulations, simulation dimensionality being an important factor. To analyse further the role of frictional stress models, we ran 3D DEM simulations, employing the soft-sphere approach to model the particle-particle contact forces. The simulation results agreed reasonably well with the empirical data, but their accuracy depended on the values used for the collision parameters; also, the 3D CFD simulations matched the empirical data more closely. Altogether, we concluded that the simulation dimensionality plays the dominant role in predicting lateral solid mixing accurately.

Type: Article
Title: Lateral solid mixing in gas-fluidized beds: CFD and DEM studies
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cherd.2016.08.014
Publisher version: http://doi.org/10.1016/j.cherd.2016.08.014
Language: English
Additional information: © 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. This manuscript version is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Fluidization, Multiphase flow, Mixing, Lateral dispersion, CFD, DEM
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1513313
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