The heat transfer coefficient for air flowing over a

Chapter 5, Problem 5.8

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

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