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|Title:||Secondary flow in semi-circular ducts|
|Citation:||Journal of Fluids Engineering-Transactions of the ASME, 2011; 133(10):101206-1-101206-8|
|Publisher:||ASME-Amer Soc Mechanical Eng|
|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|
|Appears in Collections:||Mechanical Engineering publications|
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