The inner surface of a plane wall is insulated while the outer surface is exposed to an airstream at T∞. The wall is at a uniform temperature corresponding to that of the airstream. Suddenly, a radiation heat source is switched on, applying a uniform flux 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”x (L,t)as a function of time.
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