Glass spheres of 2 mm radius and at 500 degree Celsius are to be cooled by expos

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Glass spheres of 2 mm radius and at 500 degree Celsius are to be cooled by exposing them to an air stream at 25 degree Celsius. Find maximum value of convective coefficient that is permissible. Assume the following property values
Density = 2250 kg/m³
Specific heat = 850 J/kg K
Conductivity = 1.5 W/m K

Options:

A . 245 W/m²K

B . 235 W/m²K

C . 225 W/m²K

D . 215 W/m²K

Answer: Option C
Answer: (c).225 W/m²K

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