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RADIATION ATTENUATION AND OPACITY IN SMOKE AND WATER SPRAYS

DOI: 10.1615/RAD-16.180
pages 144-151

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

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

Romain Morlon
CSTB 84 avenue Jean Jaurès - Champs-sur-Marne - 77447 Marne-la-Vallée Cedex 2, France

Elizabeth Blanchard
CSTB 84 avenue Jean Jaurès - Champs-sur-Marne - 77447 Marne-la-Vallée Cedex 2, France

Abstract

Radiation attenuation through sprays, smoke and mixings of both media was studied in the infrared and in the visible range, by conducting real scale experiments in a corridor. The effect of water injection by a water mist nozzle and a sprinkler device was investigated. Radiation attenuation in the infrared range and opacity in the visible range were measured, by using a FTIR spectrometer and a dedicated opacimetry device especially built for the present application. Measurements were done using a blackbody source and a heptane pool fire aimed at producing smoke. For opacimetry measurements the difficulties raised by the harsh environment involving a hot mixing of gas, soot and vapor carrying water droplets was circumvented with an original device involving an optical fiber network. The better attenuation capability of the water mist has been confirmed despite a lower water flow rate. Present data were used to evaluate the water droplet volumetric fraction by using a Monte Carlo simulation.

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