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Experimental study of radiative heat transfer in a translucent fuel sample exposed to different spectral sources
University of Edinburgh, United Kingdom; Centre d'Etudes et de Recherches de l'Industrie du Béton, France.
Airbus Operation SAS, Sweden.
University of Edinburgh, United Kingdom; Imperial College London, United Kingdom.
University of Edinburgh, United Kingdom; University of Queensland, Australia.
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2013 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 61, no 1, p. 742-748Article in journal (Refereed) Published
Abstract [en]

Radiative heat transfer to a solid is a key mechanism in fire dynamics, and in-depth absorption is especially of importance for translucent fuels. The sample-heater interaction for radiative heat transfer is experimentally investigated in this study with two different heaters (electric resistance and tungsten lamp) using clear PolyMethylMethAcrylate (PMMA) samples from two different formulations (Plexiglass and Lucite). First, the significant effects of the heater type and operating temperature on the radiative heat transfer are revealed with broadband measurements of transmittance on samples of different thicknesses. Then, the attenuation coefficient in Beer-Lambert's law has been calculated from detailed spectral measurements over the full wavelength range encountered in real fires. The measurements present large spectral heterogeneity. These experimental results and calculation of in-depth absorption are used to explain the reason behind the apparent variation of the fuel absorbance with the sample thickness observed in past studies. The measurement of the spectral intensity emitted by the heaters verifies that the common assumption of blackbody behavior is correct for the electric resistance, whereas the tungsten lamp does not even behave as a greybody. This investigation proofs the necessity of a multi-band radiation model to calculate accurately the fire radiative heat transfer which affects directly the in-depth temperature profiles and hence the pyrolysis process for translucent fuel.

Place, publisher, year, edition, pages
2013. Vol. 61, no 1, p. 742-748
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Natural Sciences
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URN: urn:nbn:se:ri:diva-6458DOI: 10.1016/j.ijheatmasstransfer.2013.02.017Scopus ID: 2-s2.0-84875153195Local ID: 15189OAI: oai:DiVA.org:ri-6458DiVA, id: diva2:964296
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-05-25Bibliographically approved

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