Effect of Wind on Smoldering Combustion Limits of Moist Pine Needle Beds

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dc.contributor.authorPablo Valdivieso, Juan
dc.contributor.authorde Dios Rivera, Juan
dc.date.accessioned2025-01-23T21:41:40Z
dc.date.available2025-01-23T21:41:40Z
dc.date.issued2014
dc.description.abstractWe studied moist pine needle beds burning under the effect of wind, in order to determine the upper moisture limit for which there is fire propagation for different wind velocities. For this purpose we built a wind tunnel that allowed us to burn a 600 mm by 150 mm by 40 mm bed under wind velocities between 0.5 m/s and 5.0 m/s and controlled air temperature. Results show an increase in moisture limit from 54% to approximately 140%, for the velocity range indicated. Combustion at limiting conditions proceeds mainly by smoldering with some periods of flaming combustion. It was observed that, for conditions close to extinction, the smoldering front is not quenched at the surface. Additionally, it was also observed that a strong flow of hot gases exit from the fuel bed at the free surface. These two observations lead to the conclusion that the main heat sink is moisture evaporation and that heat losses to the surroundings is reduced by the blowing effect of the hot gases coming off the bed. A dimensional analysis suggests a correlation between moisture limit and wind velocity of the form M = A - B/ (w) (2) , where M is moisture limit for fire propagation, A and B are constants, and (w) is wind speed. Two dimensionless numbers helped to plot the smoldering temperature and fire propagation velocity in a more meaningful way. They are and , where T (sml) is smoldering temperature, c (p,g) is the gas specific heat, M is fuel moisture content and h (fg) is the latent heat of water evaporation. A relatively high moisture limit at 5 m/s wind velocity is possible due to the relatively high air flow into the smoldering front and the efficient heat feedback produced in forward smoldering.
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10694-013-0357-2
dc.identifier.eissn1572-8099
dc.identifier.issn0015-2684
dc.identifier.urihttps://doi.org/10.1007/s10694-013-0357-2
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101645
dc.identifier.wosidWOS:000343721200015
dc.issue.numero6
dc.language.isoen
dc.pagina.final1605
dc.pagina.inicio1589
dc.revistaFire technology
dc.rightsacceso restringido
dc.subjectWildfire
dc.subjectSmoldering
dc.subjectFire propagation
dc.subjectMoist fuel
dc.subjectFuel bed
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleEffect of Wind on Smoldering Combustion Limits of Moist Pine Needle Beds
dc.typeartículo
dc.volumen50
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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