Secondary flow in semi-circular ducts
Date
2011
Authors
Larsson, I.
Lindmark, E.
Lundstrom, T.
Nathan, G.
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Journal article
Citation
Journal of Fluids Engineering, 2011; 133(10):101206-1-101206-8
Statement of Responsibility
I.A.S. Larsson, E.M. Lindmark, T.S. Lundstrӧm and G.J. Nathan
Conference Name
Abstract
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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Dissertation Note
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© 2011 American Society of Mechanical Engineers