Chemical and Process Engineering Resources

Section 4: Forced Convection Flow Across Single Circular Cylinders and Tube Bundles
Eq. (18) |
Â
Eq. (19) |
Â
Eq. (20) |
D = cylinder diameter, um = free-stream velocity, all properties at fluid bulk mean temperature. Correction for temperature dependent fluid properties see section 4-4.
4-1 Smooth Circular Cylinder
Eq. (21) | |
where: |
Â
Eq. (22) |
Valid over the ranges 10 < Rel < 107 and 0.6 < Pr < 1000.
4-2 Tube Bundle
Transverse pitch ratio
Longitudinal pitch ratio
Void ratio for b > 1
for b < 1
Nu0,bundle = fANul,0 (Gnielinski)
Nul,0 according to section 4-1 with instead of Rel.
Arrangement factor fA depends on tube bundle arrangement.
![]() | In line arrangement: | Eq. (23) |
Â
![]() | Staggered arrangement: | Eq. (24) |
Â
4-3 Finned Tube Bundle
![]() |
In-line tube bundle arrangement:
![]() | Eq. (25) |
Staggered tube bundle arrangement:
![]() | Eq. (26) |
Â
4-4 Effects of Property Variation with Temperature
Liquids:
![]() | Eq. (27) |
Â
![]() | Eq. (28) |
Subscript w: at wall temperature, without subscript: at mean fluid temperature.
Gases:
![]() | Eq. (29) |
Â
![]() | Eq. (30) |
Temperatures in Kelvin.
0 Comments