- Author
-
Hasemi, Y.
|
Yoshida, M.
|
Nohara, A.
- Title
- Unsteady-State Flame Spreading Velocity Along a Vertical Combustible Solid.
- Coporate
- Building Research Inst., Tokyo, Japan
Science Univ. of Tokyo, Japan
- Journal
-
Journal of Architecture, Planning and Environmental Engineering,
No. 414,
155-161,
August 1990
- Keywords
-
combustible solids
|
flame spread
|
velocity
|
heat transfer
|
steady state
- Abstract
- [ABSTRACT IN ENGLISH] A theoretical solution of unsteady-sate flame spreading velocity along a vertical combustible solid is derived on the basis of previous experimental relations on the heat transfer from the flame to the surface. From the comparison of this with the steady-state solutions, it was found that spontaneous flame spreading velocity under arbitorary conditions falls within relatively narrow range. Measurements of flame spread along vertical PMMA slabs with and without external radiation were made to verify the solution, which have revealed considerable acceleration of flame spread due to external radiation. Application of the theory to the evaluation of this influence has resulted in 20-40% overestimate of flame spreading velocity. This error is attributed to the higher pyrolysis temperature in the experiments, especially in those with external radiation, than in the calculation and the overestimate of heat release rate in the calculation in which the dripping of melted fuel is not considered.