Influence of Density on Foam Collapse under Burning - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Polymers Année : 2021

Influence of Density on Foam Collapse under Burning

(1) , (1) , (2) , (3) , (3) , (1) , (2)
1
2
3

Résumé

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.

Domaines

Chimie Polymères
Fichier principal
Vignette du fichier
polymers-13-00013-v2 (1).pdf (7.42 Mo) Télécharger le fichier
Vignette du fichier
polymers-13-00554-v2.pdf (190.26 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03093651 , version 1 (22-02-2021)

Identifiants

Citer

Abdoul Fayçal Baguian, Salifou Koucka Ouiminga, Claire Longuet, Anne-Sophie Caro-Bretelle, Stéphane Corn, et al.. Influence of Density on Foam Collapse under Burning. Polymers, 2021, 13 (1), pp.13. ⟨10.3390/polym13010013⟩. ⟨hal-03093651⟩
106 Consultations
107 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More