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Que. A pipe of outside diameter₂0 mm is to be insulated with asbestos which has a mean thermal conductivity of 0.1 W/m degree. The local coefficient of convective heat to the surroundings is 5 W/square meter degree. Find the critical radius of insulation for optimum heat transfer from pipe?
a. 10 mm
b. 20 mm
c. 30 mm
d. 40 mm
Correct Answer:20 mm
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