Question

Prob 3 A 1 m high slab of PMMA is ignited at the bottom and spreads upward. Ignition is applied over a length of 5 cm. If the slab is 1 mm thick and ignited on both sides, what is the flame spread? then how long will it take to be fully involved in pyrolysis? Assume the flame height is governed by 0.01Q', where flame height is in meters and Q'is in kW/m. The flame heat flux is 25 kW/m2; assume m- . K-0.18 WmK ?=1180 kg/m 3, C,-1.8J/gK, Tg-378°C,Tz25°C. 1.6k/ 1.6 kJ/g he-28 k/g.

Answer 1

fted at the botm ond spcads pard aton s appd 9n a length - The Plame heat lox is 2s Km2

2. to.com tHese 378 (2.374 25 dT PJ Now, The saled Hme Pj