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

Post your comment / Share knowledge


Enter the code shown above:
 
(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)