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Experiments in nearly homogenous turbulent shear flow with a uniform mean temperature gradient. Part 1

Published online by Cambridge University Press:  20 April 2006

Stavros Tavoularis  and
Stanley Corrsin
Stavros Tavoularis
Affiliation:
Present address: Department of Mechanical Engineering, University of Ottawa, Ottawa, Canada K1N 6N5. Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
Stanley Corrsin
Affiliation:
Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
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Abstract

A reasonably uniform mean temperature gradient has been superimposed upon a nearly homogeneous turbulent shear flow in a wind tunnel. The overheat is small enough to have negligible effect on the turbulence. Away from the wind-tunnel entrance, the transverse statistical homogeneity is good and the temperature fluctuations and their integral scales grow monotonically like the corresponding velocity fluctuations (Harris, Graham & Corrsin 1977). Measurements of several moments, one- and two-point correlation functions, spectra, integral scales, microscales, probability densities, and joint probability densities of the turbulent velocities, temperature fluctuations, and temperature-velocity products are reported. The heat-transport characteristics are much like those of momentum transport, with the turbulent Prandtl number nearly 1. The temperature fluctuation is better correlated with the streamwise than the transverse velocity component, and the cross-component D12 of the turbulent diffusivity tensor has sign opposite to and about twice the magnitude of the diagonal component D22. Some resemblance of directional properties (relative magnitudes of correlation functions, integral scales, microscales) of the temperature with those of the streamwise velocity is also observed. Comparisons of the present data with measurements in the inner part of a heated boundary layer and a fully turbulent pipe flow (x2/d = 0·25) show comparable magnitudes of temperature-velocity correlation coefficients, turbulent Prandtl numbers and ratios of turbulent diffusivities, and show similar shapes of two-point correlation functions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 104 , March 1981 , pp. 311 - 347
Copyright
© 1981 Cambridge University Press

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