The heat transfer coefficient for air flowing over a sphere is to be determined by observing the temperature-time history of a sphere fabricated from pure copper. The sphere, which is 12.7 mm in diameter, is at 66oc before it is inserted into an airstream having a temperature of 27o. A thermocouple on the outer surface of the sphere indicates 55oc, 69 s after the sphere is inserted into the airstream. Assume and then justify that the sphere behaves as a space wise isothermal object and calculate the heat transfer coefficient.
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