The Effect of Torsion on the Bifurcation Structure of Laminar Flow in a Helical Square Duct

[+] Author and Article Information
C. J. Bolinder

Division of Heat Transfer, Lund Institute of Technology, Box 118, 221 00 Lund, Sweden

J. Fluids Eng 117(2), 242-248 (Jun 01, 1995) (7 pages) doi:10.1115/1.2817136 History: Received February 08, 1994; Revised August 04, 1994; Online December 04, 2007


The laminar fully developed flow problem in a helical square duct with a finite pitch is solved numerically using the finite-volume method with the SIMPLEC algorithm. h2 -extrapolation is used to locate the limit points of the stable solution branches. Results for the friction factor are presented. For helical ducts of small pitch, or torsion, it is verified that all investigated flow properties are very similar to those for a toroidal duct with the same dimensionless curvature. A new correlation is proposed for the friction factor ratio.

Copyright © 1995 by The American Society of Mechanical Engineers
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