Jump to content



Chemical and Process Engineering Resources

Correlations for Convective Heat Transfer

Nov 08 2010 01:20 PM | bspang in Heat Transfer ***** Share this topic:
| More

Section 5: Forced Convection Flow over a Flat Plate

convection_16convection_17

All properties at mean film temperature convection_18.

Laminar boundary layer, constant wall temperature:

convection_eq_31(Pohlhausen)Eq. (31)

valid for ReL < 2·105, 0.6 < Pr < 10

Turbulent boundary layer along the whole plate, constant wall temperature:

convection_eq_32(Petukhov)Eq. (32)

Boundary layer with laminar-turbulent transition:

convection_eq_33(Gnielinski)Eq. (33)


Section 6: Natural Convection

All properties at convection_19.

convection_20L = characteristic length (see below)

 

Table 1: Characteric Length
Nu0"Length" L
Vertical Wall0.67H
Horizontal Cylinder0.36D
Sphere2.00D

For ideal gases: convection_21(temperature in K)

convection_eq_34(Churchill, Thelen)Eq. (34)

valid for 10-4 < Gr Pr < 4·1014, 0.022 < Pr < 7640, and constant wall temperature.





Heat Transfer Articles



0 Comments