Correlations for Convective Heat Transfer

Nov 08 2010 01:20 PM | bspang in Heat Transfer

Section 7: Film Condensation

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

Exception: ?_D = vapor density at saturation temperature T_s

7-1 Laminar Film Condensation

Vertical wall or tube:

(Nusselt)

Eq. (35)

T_w = mean wall temperature

Horizontal cylinder:

(Nusselt)

Eq. (36)

T_w = const.

7-2 Turbulent Film Condensation

For vertical wall:

Re = C A^m

convection_23

Re_crit = 350

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

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