A device for performing boiling experiments consists of
Chapter 10, Problem 10.26(choose chapter or problem)
A device for performing boiling experiments consists of acopper bar (k?400 W/m?K), which is exposed to a boil-ing liquid at one end, encapsulates an electrical heater atthe other end, and is well insulated from its surroundingsat all but the exposed surface. Thermocouples inserted inthe bar are used to measure temperatures at distances ofx1?10 mm and x2?25 mm from the surface.Copper bar, k Electrical heater (a) An experiment is performed to determine the boil-ing characteristics of a special coating applied tothe exposed surface. Under steady-state condi-tions, nucleate boiling is maintained in saturatedwater at atmospheric pressure, and values ofT1?133.7?C and T2?158.6?C are recorded. Ifn?1, what value of the coefficient Cs,fis associ-ated with the Rohsenow correlation?(b) Assuming applicability of the Rohsenow correla-tion with the value of Cs,fdetermined from part(a), compute and plot the excess temperature ?Teas a function of the boiling heat flux for105?q?s?106W/m2. What are the correspondingvalues of T1and T2for q?s?106W/m2? If q?swereincreased to 1.5?106W/m2, could the foregoingresults be extrapolated to infer the correspondingvalues of ?Te, T1, and T2?
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