Author:
ELKINS CHRISTOPHER J.,EATON JOHN K.
Abstract
Measurements in the turbulent momentum and thermal boundary layers on a rotating
disk with a uniform heat flux surface are described for Reynolds numbers up to 106.
Measurements include mean velocities and temperatures, all six Reynolds stresses,
turbulent temperature fluctuations, and three turbulent heat fluxes. The mean velocity
profiles have no wake region, but the mean temperature profiles do. The turbulent
temperature fluctuations have a large peak in the outer layer, and there is a third
turbulent heat flux in the cross-flow direction. Correlation coefficients and structure
parameters are not constant across the boundary layer as they are in two-dimensional
boundary layers (2DBLs), and their values are lower. The turbulent Prandtl number
agrees with 2DBL values in the lower part of the outer region but is reduced from the
2DBL values higher in the boundary layer. In the outer region of the boundary layer,
the transport processes differ significantly from what is observed in two-dimensional
turbulent boundary layers: ejections dominate the transport of momentum while both
ejections and sweeps contribute to the transport of the passive scalar.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
28 articles.
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