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in Mass Transfer by (37.1k points)
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

1 Answer

0 votes
by (39.8k points)
Right answer is (a) 458.32 W/m^2 K

Best explanation: h = Nusselt number (k/d) = 458.32 W/m^2 K.

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