Chapter 10 Boiling and Condensation10-23Water is boiled at sea level (1 atm pressure) and thus at a saturation (or boiling) temperature of Tsat= 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. Assumptions1Steady operating conditions exist. 2Heat losses from the pan are negligible. 3The boiling regime is nucleate boiling (this assumption will be checked later). PropertiesThe properties of water at the saturation temperature of 100°C are (Tables 10-1 and A-9) HeatingP = 1 atmTs100°C Water ρσlvl====957 90600 0589175....kg / mkg / mN/mPr33hfglpl=×⋅=⋅°−2257 100282 10421733J/kgkg m / sC J/kgCμ.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. Csf=AnalysisThe rate of heat transfer to the water and the heat flux are 22222evap3evapevapW/m2,402,000=)m2W)/(0.0314470,75(/m03142.04
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