5.2 The inner surface of a plane wall is insulatedouter surface is exposed to an airstream at T. The wallis at a uniform temperature corresponding to that of theairstream. Suddenly, a radiation heat source is switchedon, applying a uniform flux g" to the outer surface. a) Sketch and label, on T-x coordinates, the temperature distributions: initial, steady-state, and at two intermediate times. (b) Sketch the heat flux at the outer surface q(L, t) as a function of time.

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