Author(s): C.J. Bolinder & B. Sunden
flow forced convective heat
transfer in a helical square duct with a
Bolinder & B.
Division of Heat Transfer, Lund Institute of
Technology, Box 118, 221 00 Lund, Sweden
The effect of a finite pitch or torsion on the temperature field and the Nusselt
number for laminar flow in a helical square duct is presented.
conditions are assumed.
As thermal boundary condition is used constant axial
wall heat flux with constant peripheral wall temperature.
For ducts of small and
moderate pitch, the flow and heat transfer characteristics are found to be very
similar to those for a toroidal duct with the same dimensionless curvature £.
Curved ducts frequently appear in heat transfer applications, and are often
The mean heat transfer rate for laminar flow is increased com-
pared to straight ducts.
This is due to the so-called secondary flow, which is set
up in the curved duct.
By applying curv...
Size: 833 kb
Paper DOI: 10.2495/HT940121
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