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Heat Transfer

Q1: The critical radius 'r' of insulation on a pipe is given by

A r = 2k/h

B r = k/h

C r = k/2h

D r = h/k

ANS:B - r = k/h

The critical radius of insulation on a pipe, denoted by r, is given by: ℎr=hk​ Where:

  • k is the thermal conductivity of the insulation material.
  • ℎ is the convective heat transfer coefficient between the outer surface of the insulation and the surrounding medium.
Therefore, the correct option is: r=hk​
 



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