Question: Problem 8: (a) Consider a spherical shell of inner radius r, outer radius r2, thermal conductivity k, and emissivity . The outer surface of

Problem 8: (a) Consider a spherical shell of inner radius r, outer radius r2, thermal conductivity k, and emissivity . The outer surface of the shell is subjected to radiation to surrounding surfaces at Tsurr, but the direction of heat transfer is not known. Express the radiation boundary condition on the outer surface of the shell. (b) A container consists of two spherical layers, A and B, that are in perfect contact. If the radius of the interface is ro, express the boundary conditions at the interface.

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