A small copper sphere, initially at a uniform,
Chapter 10, Problem 10.27(choose chapter or problem)
A small copper sphere, initially at a uniform, elevatedtemperature T(0)?Ti, is suddenly immersed in alarge fluid bath maintained at Tsat. The initial tempera-ture of the sphere exceeds the Leidenfrost point corre-sponding to the temperature TDof Figure 10.4.(a) Sketch the variation of the average sphere temper-ature, , with time during the quenching process.Indicate on this sketch the temperatures Ti, TD, andTsat, as well as the regimes of film, transition, andnucleate boiling and the regime of single-phaseconvection. Identify key features of the tempera-ture history.(b) At what time(s) in this cooling process do youexpect the surface temperature of the sphere todeviate most from its center temperature? Explainyour answer.
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