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    Simplified multiple equations' inverse problem of vented vessels subjected to internal gas explosions

    Access Status
    Fulltext not available
    Authors
    Hernandez, F.
    Abdel-jawad, M.
    Hao, Hong
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Hernandez, F. and Abdel-jawad, M. and Hao, H. 2015. Simplified multiple equations' inverse problem of vented vessels subjected to internal gas explosions. Journal of Loss Prevention in the Process Industries. 35: pp. 65-79.
    Source Title
    Journal of Loss Prevention in the Process Industries
    DOI
    10.1016/j.jlp.2015.03.007
    ISSN
    0950-4230
    School
    Department of Civil Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LP130100919
    URI
    http://hdl.handle.net/20.500.11937/6276
    Collection
    • Curtin Research Publications
    Abstract

    This paper analyses the experimental data reported by Höchst and Leuckel (1998) for combustion in partially confined vessels and uses the data from these experiments to establish the burning rate based on a simplified model for the combustion process in such vessels. The model establishes three fundamental parameters which are necessary in characterizing the combustion process. These are: i) the burning rate, ii) the fraction of vent area occupied by burnt gas (or discharge sub-model), and iii) the vent area model (if cover mechanisms with variable vent areas are utilized). A set of independent equations is derived to determine the burning rate according to conservation of mass and volume for each gas fraction separately along with a general equation based on general volume conservation. Using this method we are able to describe the combustion process and examine the effect of various discharge models. The advantages of the model presented here include rapid applicability and a valuable analysis to derive mass burn rate and other useful parameters using experimental data from vented explosions with reasonable residual reactant values. Based on these results, the correct interpretation of the obtained burning rate can be used in order to explain the correct prediction of flame velocity and position according to a reasonable discharge model. The paper also evaluates the suitability of several discharge models for phenomenological models of vented explosions. The most appropriate is a Heaviside step function which considers that only unburnt gas is initially expelled, with that component decreasing and the burnt gas component increasing until finally only burnt gas is expelled. The obtained results in this study can be used to predict the burning rate behavior and the combustion process of similar problems.

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