A spherical heater of 20 cm diameter and at 60 degree Celsius is immersed in a tank of water at 20 degree Celsius. Determine the value of convective heat transfer coefficient
(a) 458.32 W/m^2 K
(b) 558.32 W/m^2 K
(c) 658.32 W/m^2 K
(d) 758.32 W/m^2 K
The question was asked in a national level competition.
I'd like to ask this question from Correlations for Free Convection in section Diffusion in Solids and Molecular Diffusion in Fluids of Mass Transfer