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Boiling 3 A sphere made of aluminium alloy 2024 with a diameter of 20 mm...

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Boiling 3 A sphere made of aluminium alloy 2024 with a diameter of 20 mm and a uniform temperature of 500 C is suddenly immersed in a saturated water bath maintained at atmospheric pressure The surface of the sphere has an emissivity of 0 25 Calculate the total heat transfer coefficient for the initial condition What fraction of the total coefficient is contributed by radiation Answers h 180 W m K fraction 6 7

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