A thick oak wall, initially at 25C, is suddenly exposedto

Chapter 5, Problem 5.92

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A thick oak wall, initially at 25C, is suddenly exposedto combustion products for which T??800C andh?20 W/m2?K.(a) Determine the time of exposure required for thesurface to reach the ignition temperature of 400C.(b) Plot the temperature distribution T(x) in themedium at t?325 s. The distribution shouldextend to a location for which T?25C.

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