A 1.75-inch-diameter sphere with an emissivity of 0.95 is enclosed by a large surface with a temperature of 40oF. If the surface of the sphere is maintained at 500oF, find the heat transfer from the sphere if it is surrounded by stagnant 90oF air.
Properties of air at 295oF:
k = 0.0203 Btu/(hr-ft-R)
Kinematic Viscosity = 1.113 ft2/hr
Pr = 0.689
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