Thermodynamics HW Solutions 792

Thermodynamics HW Solutions 792 - Chapter 10 Boiling and...

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Unformatted text preview: Chapter 10 Boiling and Condensation 10-12 Water is boiled at 1 atm pressure and thus at a saturation (or boiling) temperature of T sat = 100 C by a mechanically polished stainless steel heating element. The maximum heat flux in the nucleate boiling regime and the surface temperature of the heater for that case are to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the boiler are negligible. Properties The properties of water at the saturation temperature of 100 C are (Tables 10-1 and A-9) P = 1 atm q max T s = ? Water, 100 C Heating element l v l = = = = 957 9 0 60 0 0589 175 . . . . kg / m kg / m N / m Pr 3 3 h fg l pl = = = 2257 10 0282 10 4217 3 3 J / kg kg m / s C J / k g C . Also, 0.0130 and n = 1.0 for the boiling of water on a mechanically polished stainless steel surface (Table 10-3). Note that we expressed the properties in units specified under Eqs. 10-2 and 10-3 in connection with their definitions in order to avoid unit manipulations. For a large horizontal heating connection with their definitions in order to avoid unit manipulations....
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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