Formula for thermal resistance of spherical shell - Heat Transfer

Q.  What is the correct formula for thermal resistance (Rk) of a spherical shell of inner and outer radii as ri and ro respectively and k being the thermal conductivity?
- Published on 12 Aug 15

a. Rk= (ri – ro ) / 4 π ri ro k
b. Rk= 4 π ri ro k / (ri – ro )
c. Rk= (ri – ro ) / 4 π k
d. Rk= ri ro / 4 π k (ri – ro )

ANSWER: Rk= (ri – ro ) / 4 π ri ro k

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