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Correlations for Convective Heat Transfer

Nov 08 2010 01:20 PM | bspang in Heat Transfer ***** Share this topic:
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Section 7: Film Condensation

All properties without subscript are for condensate at the mean temperature convection_22.

Exception: ?D = vapor density at saturation temperature Ts

7-1 Laminar Film Condensation

Vertical wall or tube:

convection_eq_35(Nusselt)Eq. (35)

Tw = mean wall temperature

Horizontal cylinder:

convection_eq_36(Nusselt)Eq. (36)

Tw = const.

7-2 Turbulent Film Condensation

For vertical wall:

Re = C Am

convection_23

Recrit = 350

For turbulent film: C = 3.8 x 10-3 and m = 3/2 (Grigull).





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