Chapter 10 Boiling and CondensationReview Problems 10-72 Steam at a saturation temperature of Tsat= 40°C condenses on the outside of a thin horizontal tube. Heat is transferred to the cooling water that enters the tube at 25°C and exits at 35°C. The rate of condensation of steam, the average overall heat transfer coefficient, and the tube length are to be determined. Assumptions1Steady operating conditions exist.2The tube can be taken to be isothermal at the bulk mean fluid temperature in the evaluation of the condensation heat transfer coefficient. 3 Liquid flow through the tube is fully developed. 4 The thickness and the thermal resistance of the tube is negligible. PropertiesThe properties of water at the saturation temperature of 40°C are hfg= 2407×103J/kg and ρv= 0.05 kg/m3. The properties of liquid water at the film temperature of 50 + 20)/2 = 35°C and at the bulk fluid temperature of (25 + 35)/2 = 30°C are (Table A-9), TTTfs=+()/sat2(==⋅Tb/inout2At 35 C: °==×=⋅°°−ρμllpll
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