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Numerical simulation of small pool fires incorporating liquid fuel motion
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Fukumoto, Kazui, Wen, Jennifer X., Li, Manhou, Ding, Yanming and Wang, Changjian (2020) Numerical simulation of small pool fires incorporating liquid fuel motion. Combustion and Flame, 213 . pp. 441-454. doi:10.1016/j.combustflame.2019.11.047 ISSN 0010-2180.
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Official URL: https://doi.org/10.1016/j.combustflame.2019.11.047
Abstract
For small-scale pool fires, Vali et al. [1] showed a pair of vortices in the liquid pool. The first vortex appeared just close to the sidewall of the container, and the second one emerged slightly away from the first vortex. Large-eddy simulations of small methanol pool fires coupled with liquid fuel convective flow were conducted using an in-house version of FireFOAM to investigate the above phenomenon. In this study, a three-dimensional liquid phase model is newly developed. The model incorporates the effects of thermocapillary Marangoni convection, buoyancy, shear stress, and evaporation. For the gas phase, the combustion model is the extended eddy dissipation concept model coupled with the laminar combustion model. This combustion model uses the viscous diffusion rate to consider laminar-turbulent transition. The predictions were in reasonably good agreement with the measured local mass burning rate, flame height and distributions of liquid temperature. The error of the mass burning rate was within 4%. The present predictions captured a pair of vortices in line with Vali et al.'s experiment [1]. Their sizes increased with increasing the liquid temperature. The Reynolds analogy could explain the sensible reason behind this trend. Shear stress and thermocapillary force caused convection in the liquid pool, and this convection formed a pair of vortices. Thermocapillary force was due to the different distributions of convective and radiative heat transfer. Sensitivity test for sub-models for the liquid phase demonstrated that their effects on the mass burning rate were all less than 5.1%. Conversely, the simulation assuming zero gravity only in the liquid phase resulted in almost 64% reduction in the mass burning rate.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QA Mathematics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Library of Congress Subject Headings (LCSH): | Flame, Eddies, Vortex-motion, Gas-liquid interfaces | |||||||||
Journal or Publication Title: | Combustion and Flame | |||||||||
Publisher: | Elsevier Inc. | |||||||||
ISSN: | 0010-2180 | |||||||||
Official Date: | March 2020 | |||||||||
Dates: |
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Volume: | 213 | |||||||||
Page Range: | pp. 441-454 | |||||||||
DOI: | 10.1016/j.combustflame.2019.11.047 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Reuse Statement (publisher, data, author rights): | ** Article version: AM ** Embargo end date: 24-12-2020 ** From Elsevier via Jisc Publications Router ** History: accepted 29-11-2019; epub 24-12-2019; issue date 31-03-2020. ** Licence for AM version of this article starting on 24-12-2020: http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 23 January 2020 | |||||||||
Date of first compliant Open Access: | 24 December 2020 | |||||||||
RIOXX Funder/Project Grant: |
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