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The effect of convective motion within liquid fuel on the mass burning rates of pool fires – a numerical study

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Xu, Baopeng and Wen, Jennifer X. (2020) The effect of convective motion within liquid fuel on the mass burning rates of pool fires – a numerical study. Proceedings of the Combustion Institute . doi:10.1016/j.proci.2020.07.099 (In Press)

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Official URL: https://doi.org/10.1016/j.proci.2020.07.099

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Abstract

To improve numerical simulation of liquid pool fires and remove the need for experimentally measured or empirically calculated mass burning rates as boundary conditions, a fully coupled three-dimensional (3-D) numerical formulation, which directly solves convective motion in the fuel region by incorporating inhomogeneous heat feedback, is formulated. The fire dynamics is modelled using the large eddy simulation (LES) approach. Incompressible laminar flow formation is applied to the liquid fuel region, assuming constant thermo-physical properties except for the density which follows the Boussinesq approximation. The numerical formulation of the two phases is solved using a fully coupled conjugate heat transfer approach at the pool surface. The coupled model is validated against published measurements for a thin-layer heptane pool fire and a deep methanol pool fire. The convective motion within the liquid phase is found to have important effects on the pool fire mass burning rate and its neglection would result in a fast rise and over-prediction of the mass burning rate.

Item Type: Journal Article
Subjects: Q Science > QA Mathematics
Q Science > QC Physics
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Fire -- Computer simulation, Marangoni effect, Heat -- Transfer, Eddies -- Computer simulation
Journal or Publication Title: Proceedings of the Combustion Institute
Publisher: Elsevier Inc.
ISSN: 1540-7489
Official Date: 20 September 2020
Dates:
DateEvent
20 September 2020Available
14 July 2020Accepted
Date of first compliant deposit: 24 September 2020
DOI: 10.1016/j.proci.2020.07.099
Status: Peer Reviewed
Publication Status: In Press
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/R029369/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIEDARCHER ServiceUNSPECIFIED
UNSPECIFIEDUniversity of Warwickhttp://dx.doi.org/10.13039/501100000741

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