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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

TURBULENT TRANSPORT PHENOMENA IN THERMALLY STRATIFIED FLOWS

Get access (open in a dialog) DOI: 10.1615/IHTC9.2190
pages 353-358

Abstract

Spectral equations were solved to discuss buoyancy effects on the various turbulence quantities in stably stratified flows with vertical uniform velocity and temperature gradients. The turbulence was assumed to be homogeneous.
The calculated result indicates that the buoyancy influences greatly the streamwise and vertical velocity fluctuations as well as the turbulent momentum and heat fluxes for fluids of small Prandtl number. The value of the vertical turbulent heat flux decreases with increasing buoyancy effect and becomes negative in the strongly stable stratified flow.
The solution in the wave number space shows that the buoyancy forces act mostly on the eddy of smaller wave number or large eddies. This is particularly evident for fluids of small Prandtl number, with the exception that it is pronounced at large Prandtl numbers in the spectrum of temperature fluctuation.