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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...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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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. |
format | Online Article Text |
id | pubmed-7793110 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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