Secondary flow in semi-circular ducts
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Date
Authors
Larsson, I.A.S.
Lindmark, E.M.
Lundström, T.S.
Nathan, G.J.
Journal Title
Journal ISSN
Volume Title
Publisher
International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics
Abstract
Paper presented at the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.
Turbulent secondary flows are motions in the transverse plane, perpendicular to a main, axial flow. They are encountered in non-circular ducts and, although the velocity is only of the order of 1-3% of the streamwise bulk velocity, can still affect the characteristics of the mean flow and the turbulent structure. In this work the focus is on secondary flow in semicircular ducts. Both numerical and experimental analyses are reported. 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 good when using a second moment closure turbulence model.
Turbulent secondary flows are motions in the transverse plane, perpendicular to a main, axial flow. They are encountered in non-circular ducts and, although the velocity is only of the order of 1-3% of the streamwise bulk velocity, can still affect the characteristics of the mean flow and the turbulent structure. In this work the focus is on secondary flow in semicircular ducts. Both numerical and experimental analyses are reported. 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 good when using a second moment closure turbulence model.
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Keywords
Semi-circular ducts, Secondary flow, Numerical analyses, Experimental analyses
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Citation
Larsson, IAS, Lindmark, EM, Lundström, TS & Nathan, GJ 2011, Secondary flow in semi-circular ducts, Paper presented to the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.