Thermodynamics HW Solutions 827

Thermodynamics HW Solutions 827 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-46 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. Assumptions 1 Steady operating conditions exist. 2 The 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, ρ vl << . Properties The properties of water at the saturation temperature of 30 ° C are h fg = 2431 × 10 3 J/kg and ρ v = 0.03 kg/m 3 . The properties of liquid water at the film temperature of TT T fs = + = () / sat 2 (30 + 20)/2 = 25 ° C are (Table A-9), μ νμ l l ll l pl l k = == × =⋅ ° ° 997 0 1002 10 1005 10 4180 0 607 3 3 6 . . /. . kg / m kg / m s m/ s C J / k g C W/m C 2 Analysis ( a )The modified latent heat of vaporization is hh C fg fg
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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.

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