Thermal resistance for convection at outer surface of spherical shell - Heat Transfer

Q.  What is the formula of the thermal resistance for convection at the outer surface of spherical shell of inner and outer radii as ri and ro respectively? Taking ho as convection heat transfer coefficient of outer fluid.
- Published on 12 Aug 15

a. Rc = 4 π ho ro2
b. Rc = 1 / 4 π ho ro2
c. Rc = 4 π ho ro
d. Rc = 1 / 4 π ho ro

ANSWER: Rc = 1 / 4 π ho ro2

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