Chemical and Process Engineering Resources

Section 5: Forced Convection Flow over a Flat Plate
![]() | ![]() |
All properties at mean film temperature .
Laminar boundary layer, constant wall temperature:
![]() | (Pohlhausen) | Eq. (31) |
valid for ReL < 2·105, 0.6 < Pr < 10
Turbulent boundary layer along the whole plate, constant wall temperature:
![]() | (Petukhov) | Eq. (32) |
Boundary layer with laminar-turbulent transition:
![]() | (Gnielinski) | Eq. (33) |
Section 6: Natural Convection
All properties at .
![]() | L = characteristic length (see below) |
Â
Nu0 | "Length" L | |
Vertical Wall | 0.67 | H |
Horizontal Cylinder | 0.36 | D |
Sphere | 2.00 | D |
For ideal gases: (temperature in K)
![]() | (Churchill, Thelen) | Eq. (34) |
valid for 10-4 < Gr Pr < 4·1014, 0.022 < Pr < 7640, and constant wall temperature.
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