Chapter 10 Boiling and Condensation10-46 Saturated steam condenses outside of vertical tube. The rate of heat transfer to the coolant, the rate of condensation and the thickness of the condensate layer at the bottom 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 wavy-laminar over the entire tube (this assumption will be verified). 5 Nusselt’s analysis can be used to determine the thickness of the condensate film layer. 6 The density of vapor is much smaller than the density of liquid, ρvl<<. PropertiesThe properties of water at the saturation temperature of 30°C are hfg= 2431×103J/kg and ρv= 0.03 kg/m3. The properties of liquid water at the film temperature of TTTfs=+=()/sat2(30 + 20)/2 = 25°C are (Table A-9), μνμlllllpllk==×⋅==×=⋅°°−−997 01002 101005 1041800 607336../..kg / mkg / m sm/sC J/kgCW/m C2Analysis(a)The modified latent heat of vaporization is hhCfgfg
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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.