Consider a spherical shell of inner radius r1, 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.
What will be an ideal response?
A spherical shell of inner radius r1, outer radius r2, and thermal conductivity k is considered. The outer surface of the shell is subjected to radiation to surrounding surfaces at . Assuming no convection and steady one-dimensional conduction in the radial direction, the radiation boundary condition on the outer surface of the shell can be expressed as
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