Chapter 10 Boiling and Condensation10-25Water is boiled at a temperature of Tsat= 150°C by hot gases flowing through a mechanically polished stainless steel pipe submerged in water whose outer surface temperature is maintained at Ts= 165°C. The rate of heat transfer to the water, the rate of evaporation, the ratio of critical heat flux to current heat flux, and the pipe surface temperature at critical heat flux conditions are to be determined.Assumptions1Steady operating conditions exist. 2Heat losses from the boiler are negligible. 3The boiling regime is nucleate boiling since ΔTTTs=−=−=°satC165 15015which is in the nucleate boiling range of 5 to 30°C for water. PropertiesThe properties of water at the saturation temperature of 150°C are (Tables 10-1 and A-9) ρσlvl====91662550 0488116....kg / mkg / mN/mPr33hfglpl=×⋅=⋅°−2114 100183 10431133J/kgkg m / sC J/kgCμ.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 Eq. 10-2 in
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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.