Numerical - Critical radius of insulation for maximum heat transfer rate - Heat Transfer

Q.  A hollow sphere of internal diameter ID = 20 cm and outer diameter OD = 30 cm contains hot fluid. What should be the critical radius of insulation for maximum rate of heat transfer? Thermal conductivity k = 0.86 W/mK and convection heat transfer coefficient  of outer fluid ho = 20 W/m2K.
- Published on 12 Aug 15

a. 0.086 cm
b. 0.86 m
c. 8.6 mm
d. 8.6 cm

ANSWER: 8.6 cm

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