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New quadrature-based moment method for the mixing of inert polydisperse fluidized powders in commercial CFD codes

Mazzei, L; Marchisio, DL; Lettieri, P; (2012) New quadrature-based moment method for the mixing of inert polydisperse fluidized powders in commercial CFD codes. AICHE JOURNAL , 58 (10) 3054 - 3069. 10.1002/aic.13714. Green open access

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Abstract

To describe the behavior of polydisperse multiphase systems in an Eulerian framework, we solved the population balance equation (PBE), letting it account only for particle size dependencies. To integrate the PBE within a commercial computational fluid dynamics code, we formulated and implemented a novel version of the quadrature method of moments (QMOM). This no longer assumes that the particles move with the same velocity, allowing the latter to be size-dependent. To verify and test the model, we simulated the mixing of inert polydisperse fluidized suspensions initially segregated, validating the results experimentally. Because the accuracy of QMOM increases with the number of moments tracked, we ran three classes of simulations, preserving the first four, six, and eight integer moments of the particle density function. We found that in some cases the numerics corrupts the higher-order moments and a corrective algorithm, designed to restore the validity of the moment set, has to be implemented.

Type: Article
Title: New quadrature-based moment method for the mixing of inert polydisperse fluidized powders in commercial CFD codes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/aic.13714
Publisher version: http://dx.doi.org/10.1002/aic.13714
Additional information: © 2012 American Institute of Chemical Engineers (AIChE). Full text made available to UCL Discovery by kind permission of Wiley.
Keywords: multiphase flows, Fluidization, quadrature method of moments, population balance, moment corruption
UCL classification: UCL > Provost and Vice Provost Offices
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: http://discovery.ucl.ac.uk/id/eprint/1352465
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