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Turbulence characteristics of the boundary layer on a rotating disk

Published online by Cambridge University Press:  26 April 2006

Howard S. Littell  and
John K. Eaton
Howard S. Littell
Affiliation:
Department of Mechanical Engineering, Standford University, Standford, CA 94305, USA Present address: Shell Development Company, Houston, Texas.
John K. Eaton
Affiliation:
Department of Mechanical Engineering, Standford University, Standford, CA 94305, USA
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Abstract

Measurements of the boundary layer on an effectively infinite rotating disk in a quiescent environment are described for Reynolds numbers up to Reδ2 = 6000. The mean flow properties were found to resemble a ‘typical’ three-dimensional crossflow, while some aspects of the turbulence measurements were significantly different from two-dimensional boundary layers that are turned. Notably, the ratio of the shear stress vector magnitude to the turbulent kinetic energy was found to be at a maximum near the wall, instead of being locally depressed as in a turned two-dimensional boundary layer. Also, the shear stress and the mean strain rate vectors were found to be more closely aligned than would be expected in a flow with this degree of crossflow. Two-point velocity correlation measurements exhibited strong asymmetries which are impossible in a two-dimensional boundary layer. Using conditional sampling, the velocity field surrounding strong Reynolds stress events was partially mapped. These data were studied in the light of the structural model of Robinson (1991), and a hypothesis describing the effect of cross-stream shear on Reynolds stress events is developed.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 266 , 10 May 1994 , pp. 175 - 207
Copyright
© 1994 Cambridge University Press

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