Combustion propagation through solid materials I—downward propagation of smouldering along a thin vertical sheet of paper
✍ Scribed by Tosiro Kinbara; Hiroshi Endo; Setsuko Sega
- Publisher
- Elsevier Science
- Year
- 1966
- Tongue
- English
- Weight
- 871 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
As the first step in the general study of the propagation o] combustion in the open air through solid materials which contain no oxidant in themselves, the downward propagation of smouldering along vertical strips oJ cardboard was" studied. The velocity v of combustion propagation perpendicular to the ]ire front was observed in a large chamber o[ temperature Ta with strips of breadth b and thickness d. The result,J were summarized and an experimental formula for v in terms of b, d and Ta was obtained. In the theoretical part, it was assumed that: (1) the heat produced by the combustion of a solid body per unit time is proportional to the rate of the air supplied by natural convection which, again, is assumed to be proportional to (T--T a) where T is the temperature o] the solid body; (2) this heat is inversely proportional to (Ti--Ta) where Ti is the temperature at which the solid material ignites instantaneously, and (3) there is a stagnant boundary layer of combustion gases covering the surIace of the solid and both the fresh air supply and heat dissipation [row the solid into the air take place at the surface o] this layer. The formula ]or v derived mathematically with these assumptions showed a perfect coincidence with the experimental formula.