Formula for thermal resistance of hollow cylinder - Heat Transfer

Q.  What is the formula for the thermal resistance (R) of a hollow cylinder of internal radius Ri, outer radius Ro and the length l ? Thermal conductivity of the cylinder material is k. The heat flows from inner side to outer side.
- Published on 12 Aug 15

a. R = ln (Ro / Ri) / 2πkl
b. R = ln (Ri / Ro) / 2πkl
c. R = (Ro + Ri) / 2πkl
d. R = (RoRi) / 2πkl

ANSWER: R = ln (Ro / Ri) / 2πkl

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