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Início - ICHMT DL Ano atual Arquivos Comitê executivo Centro Internacional para Transferência de Calor e Massa

RADIATIVE PROPERTIES IN THE FRAME OF FOREST FIRES

DOI: 10.1615/ICHMT.2010.RAD-6.430
10 pages

Gilles Parent
Laboratoire Energies et Mecanique Theorique et Appliquee (LEMTA), Universite de Lorraine-CNRS, UMR 7563, Vandoeuvre-les-Nancy 54505, France

Z. Acem
LEMTA (Laboratoire d'Energétique et de Mécanique Théorique et Appliquée) CNRS UMR 7563 – Université Henri Poincaré, Nancy 1 Faculté des Sciences et Techniques BP 70239 - 54506

A. Collin
LEMTA (Laboratoire d'Energéetique et de Mécanique Théorique et Appliquée), CNRS UMR 7563 - Université Henri Poincaré, Nancy 1, Faculté des Sciences et Techniques BP 239 - 54506 VANDCEUVRE Cedex

Pascal Boulet
LEMTA (Laboratoire d'Energéetique et de Mécanique Théorique et Appliquée), CNRS UMR 7563 - Université Henri Poincaré, Nancy 1, Faculté des Sciences et Techniques BP 239 - 54506 VANDCEUVRE Cedex

Resumo

Measurements have been carried out regarding emission and reception of thermal radiation, in the frame of the forest fire application. Based on FTIR spectroscopy techniques, the absorption of the vegetation matter has been studied. The commonly used assumptions of grey or black surface behavior have been observed to be questionable. Averaged absorptivities around 0.90 have been computed after integration over the wavelength range of interest, but important variations are observed in the short infrared indicating an obvious non-grey behavior. In parallel, the emission of radiation has been also measured on flames of vegetation at laboratory scale. For these relatively small scale flames, the radiation is mainly due to hot gases and the contribution of soot is very small. The observed flames are optically thin. Important fluxes can be emitted however by the burning vegetation itself. A strong background in the whole wavelength range is then superimposed to peaks still due to the hot gases in the flame. The present study on flame emission has been done by comparing fluxes received from flames generated by vegetation in trays with those of a reference emitter, but further measurements at larger scales are now required for a confirmation of the observations.

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