A 5 cm diameter exhaust pipe at 700 K has an opaque outer surface and emissivity of 0.9. A galvanized gray sheet iron tube of 15 cm diameter is placed concentrically around the pipe. If the tube is to have a temperature of no more than 350 K, determine the maximum heat transfer that can be dissipated per unit length of the pipes.
What will be an ideal response?
Referring to the sketch, denoting surface 1 as the exhaust pipe and surface 2 as the shield,
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