Question: A thick oak wall, initially at 25C, is suddenly exposed to combustion products for which T = 800C and h=20W/m 2 K. (a)

A thick oak wall, initially at 25°C, is suddenly exposed to combustion products for which T∞ = 800°C and h=20W/m2 ∙ K.

(a) Determine the time of exposure required for the surface to reach the ignition temperature of 400°C.

(b) Plot the temperature distribution T(x) in the medium at t = 325 s. The distribution should extend to a location for which T = 25°C.

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