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    Simulation of gas–solid flows in riser using energy minimization multiscale model: Effect of cluster diameter correlation

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    Fulltext not available
    Authors
    Shah, Milinkumar
    Utikar, Ranjeet
    Tade, Moses
    Pareek, Vishnu
    Evans, G
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Shah, M.and Utikar, R. and Tade, M. and Pareek, V. and Evans, G. 2011. Simulation of gas–solid flows in riser using energy minimization multiscale model: Effect of cluster diameter correlation. Chemical Engineering Science. 66: pp. 3291-3300.
    Source Title
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2011.01.056
    ISSN
    00092509
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/5388
    Collection
    • Curtin Research Publications
    Abstract

    Reduced effective drag is observed in gas–solid riser flows due to formation of clusters. Thus cluster diameter correlation has direct impact on the calculated drag and the hydrodynamics predictions. However, its effect has not been studied. Therefore in this study, the effect of cluster diameter correlations on the drag coefficient and simulation predictions is evaluated. A structure-based drag is derived using the EMMS model, and is used to carry out computational fluid dynamics (CFD) simulations for low solid flux fluid catalytic cracking (FCC) risers. The results are compared with those using the Gidaspow drag model, as well as experimental data and previous simulation results. The time-averaged axial and radial profiles of voidages are compared with the experimental data. The comparison shows that only EMMS model is able to capture the axial heterogeneity with the dense bottom and dilute top sections. The radial profiles using both drag models shows only qualitative agreement with the experimental data. The results using the EMMS and Gidaspow drag model show a reasonable agreement near the wall and the centre, respectively. In order to improve the quality of the results obtained by the EMMS model, simulations are conducted using calculated drag coefficients from different cluster diameter correlations. The cluster diameter correlation proposed by Harris et al. (2002) gives reasonable qualitative and quantitative agreement with the experimental data for axial voidage profile, particularly in the dense bottom section; however, the quantitative disagreements in the radial profiles persists.

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