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On the critical conditions for pool-fire puffing

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Mecánica de Fluidoses
dc.contributor.authorMoreno Boza, Daniel
dc.contributor.authorCoenen, Wilfried Romain Stefan
dc.contributor.authorCarpio, Jaime
dc.contributor.authorSánchez Pérez, Antonio Luis
dc.contributor.authorWilliams, Forman A.
dc.date.accessioned2021-05-12T09:05:15Z
dc.date.available2021-05-12T09:05:15Z
dc.date.issued2018-06
dc.description.abstractPool fires are known to undergo a bifurcation to a globally unstable puffing state driven by baroclinic and buoyant vorticity production. Although the supercritical puffing regime away from the bifurcation has been studied extensively in the literature, no detailed account has been given of the critical conditions for its onset, that being the purpose of the present paper. For the relevant canonical case of round liquid pools without swirl, aside from the inherent thermochemical and transport parameters associated with the fuel, pool-fire puffing is governed by a single dimensionless number, the Rayleigh number, which scales with the cube of the pool diameter. Consequently, for a fixed fuel and under fixed ambient conditions, there is a critical fuel pool diameter, associated with a critical value of the Rayleigh number, above which the flame starts puffing. A global linear stability analysis that accounts for the axisymmetry of the prevailing instability mode is developed here to describe the bifurcation. The mathematical formulation employs the limit of infinitely fast reaction, with account taken of the nonunity Lewis number and vaporization characteristics of typical liquid fuels. Predictions of critical puffing conditions, including critical diameters and puffing frequencies, are provided for methanol and for heptane pool fires, and the results are compared with results of new small-scale experiments under controlled laboratory conditions, reported here, yielding reasonably good agreement.en
dc.format.extent13
dc.identifier.bibliographicCitationMoreno-Boza, D., Coenen, W., Carpio, J., Sánchez, A. L. & Williams, F. A. (2018). On the critical conditions for pool-fire puffing. Combustion and Flame, vol. 192, pp. 426–438.en
dc.identifier.doihttps://doi.org/10.1016/j.combustflame.2018.02.011
dc.identifier.issn0010-2180
dc.identifier.publicationfirstpage426
dc.identifier.publicationlastpage438
dc.identifier.publicationtitleCombustion and Flameen
dc.identifier.publicationvolume192
dc.identifier.urihttps://hdl.handle.net/10016/32604
dc.identifier.uxxiAR/0000027294
dc.language.isoeng
dc.publisherElsevieren
dc.rights© 2018 The Combustion Institute.en
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.otherLiquid pool firesen
dc.subject.otherLaminar reacting flowsen
dc.subject.otherBuoyancy-driven instabilityen
dc.titleOn the critical conditions for pool-fire puffingen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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