Turbulent secondary flows are motions in the transverse plane, perpendicular to a main, axial flow. They are encountered in non-circular ducts and can, although the velocity is only of the order of 1–3% of the streamwise bulk velocity, affect the characteristics of the mean flow and the turbulent structure. In this work, the focus is on secondary flow in semi-circular ducts which has previously not been reported. Both numerical and experimental analyses are carried out with high accuracy. It is found that the secondary flow in semi-circular ducts consists of two pairs of counter rotating corner vortices, with a velocity in the range reported previously for related configurations. Agreement between simulation and experimental results are excellent when using a second moment closure turbulence model, and when taking the experimental and numerical uncertainty into account. New and unique results of the secondary flow in semi-circular ducts have been derived from verified simulations and validating laser-based experiments.
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e-mail: sofia.larsson@ltu.se
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October 2011
Research Papers
Secondary Flow in Semi-Circular Ducts
I. A. S. Larsson,
I. A. S. Larsson
Division of Fluid Mechanics,
e-mail: sofia.larsson@ltu.se
Luleå University of Technology
, SE-97187 Luleå, Sweden
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E. M. Lindmark,
E. M. Lindmark
Division of Fluid Mechanics,
Luleå University of Technology
, SE-97187 Luleå, Sweden
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T. S. Lundström,
T. S. Lundström
Division of Fluid Mechanics,
Luleå University of Technology
, SE-97187 Luleå, Sweden
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G. J. Nathan
G. J. Nathan
School of Mechanical Engineering,
University of Adelaide
, Adelaide, Australia
Search for other works by this author on:
I. A. S. Larsson
Division of Fluid Mechanics,
Luleå University of Technology
, SE-97187 Luleå, Sweden
e-mail: sofia.larsson@ltu.se
E. M. Lindmark
Division of Fluid Mechanics,
Luleå University of Technology
, SE-97187 Luleå, Sweden
T. S. Lundström
Division of Fluid Mechanics,
Luleå University of Technology
, SE-97187 Luleå, Sweden
G. J. Nathan
School of Mechanical Engineering,
University of Adelaide
, Adelaide, Australia
J. Fluids Eng. Oct 2011, 133(10): 101206 (8 pages)
Published Online: October 4, 2011
Article history
Received:
May 2, 2011
Accepted:
August 26, 2011
Online:
October 4, 2011
Published:
October 4, 2011
Citation
Larsson, I. A. S., Lindmark, E. M., Lundström, T. S., and Nathan, G. J. (October 4, 2011). "Secondary Flow in Semi-Circular Ducts." ASME. J. Fluids Eng. October 2011; 133(10): 101206. https://doi.org/10.1115/1.4004991
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