Thermodynamics HW Solutions 825

Thermodynamics HW Solutions 825 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-44 Saturated steam at atmospheric pressure thus at a saturation temperature of T sat = 100 ° C condenses on a vertical plate which is maintained at 90 ° C by circulating cooling water through the other side. The rate of heat transfer to the plate and the rate of condensation of steam are to be determined. Assumptions 1 Steady operating conditions exist. 2 The plate is isothermal. 3 The condensate flow is wavy-laminar over the entire plate (this assumption will be verified). 4 The density of vapor is much smaller than the density of liquid, ρ vl << . Properties The properties of water at the saturation temperature of 100 ° C are h fg = 2257 × 10 3 J/kg and ρ v = 0.60 kg/m 3 . The properties of liquid water at the film temperature of TT T fs = + = () / sat 2 (100 + 90)/2 = 95 ° C are (Table A-9), μ νμ l l ll l pl l k = == × =⋅ ° ° 9615 0297 10 0309 10 4212 0677 3 3 6 . . /. . kg / m kg / m s m/ s C J / k g C W/m C 2 Analysis The modified latent heat of vaporization is hh C fg fg pl s * .( ) =+ × ° ° × 068 2257 10 10
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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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