Thermodynamics HW Solutions 802

Thermodynamics HW Solutions 802 - Chapter 10 Boiling and...

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Unformatted text preview: Chapter 10 Boiling and Condensation 10-21 Water is boiled at 1 atm pressure and thus at a saturation (or boiling) temperature of T sat = 100 C by a horizontal nickel plated copper heating element. The maximum (critical) heat flux and the temperature jump of the wire when the operating point jumps from nucleate boiling to film boiling regime 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, 0.0060 and n = 1.0 for the boiling of water on a nickel plated 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 we expressed the properties in units specified under Eqs....
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