Assumptions: 1 Steady operating conditions exist. 2 Orange is spherical in
shape. 3 Convection heat transfer coefficient is constant over the entire
surface. 4 Properties of water is used for orange.
Properties: The thermal conductivity of the orange is given to be k =
0.50 W/m.°C. The thermal conductivity and the kinematic viscosity of air
at the film temperature of (Ts + T∞)/2 = (15+5)/2 = 10°C are (Table A-15)