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    Critical review of Molkov's phenomenological model and variable stretch/turbulence function

    Access Status
    Fulltext not available
    Authors
    Hernandez, F.
    Abdel-jawad, M.
    Hao, Hong
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Hernandez, F. and Abdel-jawad, M. and Hao, H. 2016. Critical review of Molkov's phenomenological model and variable stretch/turbulence function. Journal of Loss Prevention in the Process Industries. 43: pp. 225-241.
    Source Title
    Journal of Loss Prevention in the Process Industries
    DOI
    10.1016/j.jlp.2016.05.019
    ISSN
    0950-4230
    School
    Department of Civil Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LP130100919
    URI
    http://hdl.handle.net/20.500.11937/5967
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 Elsevier Ltd. A critical review of Molkov's phenomenological model including the model's assumptions and sub-models is presented in this article. First, the effect of an incorrect discharge sub-model is studied and it is concluded that the choice of discharge sub-model is crucial because it can substantially modify the turbulence/stretch function, the mass distributions and the flame position. Therefore, a discharge sub-model should only be chosen when the sub-model is in agreement with the flame position and the residual unburnt gas mass reaches a reasonable value. Second, the equivalent flame radius and the apparent flame velocity (computed internally by Molkov's model) are found to depend on three different effects: the free flameball expansion, the adiabatic compression/extension and the venting process. Third, the interpretation of the turbulence function should account for the effect of the propagation mode and the spatial variation of the local flame speed. Fourth, the jet effect model related to hinge panels can be improved; therefore, a new model is presented. Fifth, the universal correlation and the two-lumped-parameter model are studied. Despite the high correlation reported in previous publications, it is concluded that the two-lumped-model has significant limitations and should be improved if a variable stretch/turbulence function is utilized, which will require the utilization of "usual" discharge coefficients. Finally, it is shown that the inverse problem with a variable stretch/turbulence function and a reasonable discharge coefficient can be utilized to accurately backfit experimental data.

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