An observation on the origin of secondary flow in straight noncircular ducts |
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| Authors: | M. A. Haque A. K. A. Hassan Dr. J. T. Turner Dr. H. Barrow |
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| Affiliation: | 1. Simon Engineering Laboratories, University of Manchester, Manchester, UK
2. Dept. of Mechanical Engineering, University of Liverpool, P.O. Box 147, L69 3 BX, Liverpool, UK
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| Abstract: | This note is concerned with the origin of secondary flow in straight noncircular ducts. A critical examination of the analytical expressions for the secondary flow production terms is made to show that the essential requirement for secondary flow is a finite gradient of the difference in the turbulent stresses in the plane of the duct cross section in a peripheral direction. This conclusion has been reached following an investigation of the turbulent stress distributions in unidirectional pipe flow and assumes that, in general, the normal stresses only are significant in secondary flow production. An observation is made on “vorticity reversal” in the immediate vicinity of the boundary of a noncircular duct. |
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