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Influence of Density on Foam Collapse under Burning

The fire behaviour of flexible polyurethane foams was studied using a cone calorimeter, with a special emphasis on the collapse step. Only one peak of heat release rate, ranging from 200 to 450 kW/m(2), is observed for thin foams, depending on the foam density and the heat flux. On the contrary, hea...

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Autores principales: Baguian, Abdoul Fayçal, Ouiminga, Salifou Koucka, Longuet, Claire, Caro-Bretelle, Anne-Sophie, Corn, Stéphane, Bere, Antoine, Sonnier, Rodolphe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793110/
https://www.ncbi.nlm.nih.gov/pubmed/33375196
http://dx.doi.org/10.3390/polym13010013
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author Baguian, Abdoul Fayçal
Ouiminga, Salifou Koucka
Longuet, Claire
Caro-Bretelle, Anne-Sophie
Corn, Stéphane
Bere, Antoine
Sonnier, Rodolphe
author_facet Baguian, Abdoul Fayçal
Ouiminga, Salifou Koucka
Longuet, Claire
Caro-Bretelle, Anne-Sophie
Corn, Stéphane
Bere, Antoine
Sonnier, Rodolphe
author_sort Baguian, Abdoul Fayçal
collection PubMed
description The fire behaviour of flexible polyurethane foams was studied using a cone calorimeter, with a special emphasis on the collapse step. Only one peak of heat release rate, ranging from 200 to 450 kW/m(2), is observed for thin foams, depending on the foam density and the heat flux. On the contrary, heat release rate (HRR) curves exhibit two peaks for 10 cm-thick foams, the second one corresponding to the pool fire formed after foam collapse. In all cases, the collapse occurs at a constant rate through the whole thickness. The rate of the recession of the front was calculated using digital and infrared cameras. Interestingly, its value is relatively constant whatever the heat flux (especially between 25 and 35 kW/m(2)), probably because of the very low heat conductivity preventing heat transfer through the thickness. The rate increases for the lightest foam but the fraction of burnt polymer during collapse is constant. Therefore, the pool fire is more intense for the densest foam. A simple macroscopic model taking into account only the heat transfer into the foam leads to much lower front recession rates, evidencing that the collapse is piloted by the cell walls’ rigidity.
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spelling pubmed-77931102021-01-09 Influence of Density on Foam Collapse under Burning Baguian, Abdoul Fayçal Ouiminga, Salifou Koucka Longuet, Claire Caro-Bretelle, Anne-Sophie Corn, Stéphane Bere, Antoine Sonnier, Rodolphe Polymers (Basel) Article The fire behaviour of flexible polyurethane foams was studied using a cone calorimeter, with a special emphasis on the collapse step. Only one peak of heat release rate, ranging from 200 to 450 kW/m(2), is observed for thin foams, depending on the foam density and the heat flux. On the contrary, heat release rate (HRR) curves exhibit two peaks for 10 cm-thick foams, the second one corresponding to the pool fire formed after foam collapse. In all cases, the collapse occurs at a constant rate through the whole thickness. The rate of the recession of the front was calculated using digital and infrared cameras. Interestingly, its value is relatively constant whatever the heat flux (especially between 25 and 35 kW/m(2)), probably because of the very low heat conductivity preventing heat transfer through the thickness. The rate increases for the lightest foam but the fraction of burnt polymer during collapse is constant. Therefore, the pool fire is more intense for the densest foam. A simple macroscopic model taking into account only the heat transfer into the foam leads to much lower front recession rates, evidencing that the collapse is piloted by the cell walls’ rigidity. MDPI 2020-12-22 /pmc/articles/PMC7793110/ /pubmed/33375196 http://dx.doi.org/10.3390/polym13010013 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Baguian, Abdoul Fayçal
Ouiminga, Salifou Koucka
Longuet, Claire
Caro-Bretelle, Anne-Sophie
Corn, Stéphane
Bere, Antoine
Sonnier, Rodolphe
Influence of Density on Foam Collapse under Burning
title Influence of Density on Foam Collapse under Burning
title_full Influence of Density on Foam Collapse under Burning
title_fullStr Influence of Density on Foam Collapse under Burning
title_full_unstemmed Influence of Density on Foam Collapse under Burning
title_short Influence of Density on Foam Collapse under Burning
title_sort influence of density on foam collapse under burning
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793110/
https://www.ncbi.nlm.nih.gov/pubmed/33375196
http://dx.doi.org/10.3390/polym13010013
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