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Correlations for Convective Heat TransferNov 08 2010 01:20 PM | bspang in Heat Transfer Share this topic:
Section 4: Forced Convection Flow Across Single Circular Cylinders and Tube Bundles
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
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:
4-3 Finned Tube Bundle
In-line tube bundle arrangement:
Staggered tube bundle arrangement:
4-4 Effects of Property Variation with Temperature
Subscript w: at wall temperature, without subscript: at mean fluid temperature.
Temperatures in Kelvin.