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Thermodynamics HW Solutions 807

# Thermodynamics HW Solutions 807 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-23 Water is boiled at sea level (1 atm pressure) and thus at a saturation (or boiling) temperature of T sat = 100 ° C in a teflon-pitted stainless steel pan placed on an electric burner. The water level drops by 10 cm in 30 min during boiling. The inner surface temperature of the pan is to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the pan are negligible. 3 The boiling regime is nucleate boiling (this assumption will be checked later). Properties The properties of water at the saturation temperature of 100 ° C are (Tables 10-1 and A-9) Heating P = 1 atm T s 100 ° C Water ρ σ l v l = = = = 957 9 060 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 μ . Also, 0.0058 and n = 1.0 for the boiling of water on a teflon-pitted stainless steel surface (Table 10- 3). Note that we expressed the properties in units specified under Eq. 10-2 connection with their definitions in order to avoid unit manipulations. C sf = Analysis The rate of heat transfer to the water and the heat flux are 2 2 2 2 2 evap 3 evap evap W/m 2,402,000 = ) m 2 W)/(0.0314 470 , 75 ( / m 03142 . 0 4
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