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Radiant smoldering ignition of plywood |
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| Affiliation: | 1. Research Center for Fire Safety Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR;2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China;1. Research Centre for Fire Safety Engineering, Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, Guangdong, China;1. Department of Mechanical Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi 441-8580, Japan;2. Department of Chemical Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan |
| Abstract: | This paper investigates the role of self-heating in the smoldering ignition of 18 mm (three-quarter inch) thick maple plywood exposed to radiant heat fluxes between 6 and 15 kW/m2 in the cone calorimeter for up to 8 h. The minimum heat flux for smoldering ignition was experimentally determined to be 7.5 kW/m2. This compares favorably to predictions made using classical self-heating theory. The role of self-heating was explored via temperature measurements distributed within the specimens. Elevated subsurface temperature profiles indicated self-heating was an important ignition factor resulting in ignition at depth with smolder propagation to the surface and into the material. The ignition depth was shown to be a function of the heat flux with the depth moving towards the surface as the heat flux increased. |
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