A pipe carrying hot gases is insulated with a material having a thermal conductivity of 0.15 𝑊/𝑚K. The average local heat transfer coefficient by convection to the ambient air is 3 𝑊/𝑚2𝐾. The critical diameter of the pipe under these conditions is
A. 100 𝑚𝑚
B. 130 𝑚𝑚
C. 160 𝑚𝑚
D. 200 𝑚𝑚
Answer:A
A pipe carrying hot gases is insulated with a material having a thermal conductivity of 0.15 𝑊/𝑚K. The average local heat transfer coefficient by convection to the ambient air is 3 𝑊/𝑚2𝐾. The critical diameter of the pipe under these conditions is
A. 100 𝑚𝑚 B. 130 𝑚𝑚 C. 160 𝑚𝑚 D. 200 𝑚𝑚