A sphere made of aluminum alloy 2024 with a diame-ter of
Chapter 10, Problem 10.28(choose chapter or problem)
A sphere made of aluminum alloy 2024 with a diame-ter of 20 mm and a uniform temperature of 500C issuddenly immersed in a saturated water bath main-tained at atmospheric pressure. The surface of thesphere has an emissivity of 0.25.(a) Calculate the total heat transfer coefficient for theinitial condition. What fraction of the total coeffi-cient is contributed by radiation?(b) Estimate the temperature of the sphere 30 s after itis immersed in the bath.
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