How the critical radius of an insulation layer over around a pipe can be affecte

Question

How the critical radius of an insulation layer over around a pipe can be affected if the thermal conductivity of the pipe doubles (maybe by changing the pipe's material while keeping its geometry the same)?

A) The critical radius is not affected

B) The critical radius doubles as well

C) The new critical radius will be half of that it was initially

D) Depending on the convection heat transfer coefficient outside the pipe, (A), (B), and (C) are all possible

Please provide an explanation for your answer

Explanation / Answer

D) Depending on the convection heat transfer coefficient outside the pipe, (A), (B), and (C) are all possible

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