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  3. . a 20 mm diameter sphere made of aluminum alloy 2

. A 20 mm diameter sphere made of aluminum alloy 2024 initially at a uniform temperature...

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Mechanical Engineering

. A 20 mm diameter sphere made of aluminum alloy 2024 initiallyat a uniform temperature of 500 ºC is suddenly immersed in asaturated water bath maintained at atmospheric pressure. Thesurface of the sphere has an emissivity or 0.25. Determine.

a.) the total heat transfer coefficient for this initialcondition, and

b.) what fraction of the total coefficient is contributed byradiation. (~180 W/m2 -K, ~ 7%)

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