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Type: Journal article
Title: Secondary flow in semi-circular ducts
Author: Larsson, I.
Lindmark, E.
Lundstrom, T.
Nathan, G.
Citation: Journal of Fluids Engineering-Transactions of the ASME, 2011; 133(10):101206-1-101206-8
Publisher: ASME-Amer Soc Mechanical Eng
Issue Date: 2011
ISSN: 0098-2202
Statement of
I.A.S. Larsson, E.M. Lindmark, T.S. Lundstrӧm and G.J. Nathan
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.
Keywords: Computational fluid dynamics; Doppler measurement; flow measurement; flow simulation; laser velocimetry; numerical analysis; pipe flow; turbulence; vortices
Rights: © 2011 American Society of Mechanical Engineers
RMID: 0020113597
DOI: 10.1115/1.4004991
Appears in Collections:Mechanical Engineering publications
Environment Institute Leaders publications

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