Turbulent Flow in a Three-Dimensional Channel

by Hubert J. Tracy,

Serial Information: Journal of the Hydraulics Division, 1965, Vol. 91, Issue 6, Pg. 9-35

Document Type: Journal Paper

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Abstract: The results of tests to define the Reynolds stress tensor in one corner of a straight, smooth, closed conduit of rectangular cross section were presented. The measurements are used in conjunction with a simplified version of the equations of motion to conclude that secondary motions will be present in any established flow in a conduit of noncircular section. One of the boundaries may be a free surface. The sustaining mechanism for the secondary motion is shown to depend on the horizontal and vertical components of the turbulent motion. A physical justification for the measured behavior of these components is obtainable from the consideration that the magnitude of a velocity fluctuation normal to a boundary is inhibited by proximity to the boundary, whereas a similar restriction on the component parallel to the boundary does not exist. Direct measurements of the secondary motions were obtained.

Subject Headings: Domain boundary | Equations of motion | Motion (dynamics) | Conduits | Flow measurement | Turbulent flow | Three-dimensional flow | Reynolds stress

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