Chapter 10 Boiling and Condensation10-73 Saturated ammonia at a saturation temperature of Tsat= 25°C condenses on the outer surface of vertical tube which is maintained at 15°C by circulating cooling water. The rate of heat transfer to the coolant and the rate of condensation of ammonia are to be determined.Assumptions1Steady operating conditions exist.2The tube is isothermal. 3 The tube can be treated as a vertical plate. 4 The condensate flow is turbulentr over the entire tube (this assumption will be verified). 5 The density of vapor is much smaller than the density of liquid, ρvl<<. PropertiesThe properties of ammonia at the saturation temperature of 25°C are hfg= 1166×103J/kg and ρv= 7.809 kg/m3. The properties of liquid ammonia at the film temperature of TTTfs=+=()/sat2(25 + 15)/2 = 20°C are (Table A-11), Ammonia25°C CondensateLtube= 2 mD=3.2 cm15°C463.1PrCW/m4927.0CJ/kg4745C/sm102489.0/skg/m10519.1kg/m2.610264-3=°⋅=°⋅=×==⋅×==−llpllllllkρμνμAnalysis(a
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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.