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Turbulence structure in stably stratified open-channel flow

Published online by Cambridge University Press:  20 April 2006

Satoru Komori ,
Hiromasa Ueda ,
Fumimaru Ogino  and
Tokuro Mizushina
Satoru Komori
Affiliation:
Division of Atmospheric Environment, The National Institute for Environmental Studies, Ibaraki 305, Japan
Hiromasa Ueda
Affiliation:
Division of Atmospheric Environment, The National Institute for Environmental Studies, Ibaraki 305, Japan
Fumimaru Ogino
Affiliation:
Department of Chemical Engineering, Kyoto University, Kyoto 606, Japan
Tokuro Mizushina
Affiliation:
Department of Chemical Engineering, Kyoto University, Kyoto 606, Japan
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Abstract

The effects of stable stratification on turbulence structure have been experimentally investigated in stratified open-channel flow and a theoretical spectral-equation model has been applied to the stably stratified flow. The measurements were made in the outer layer of open-channel flow with strongly stable density gradient, where the wall effect was small. Velocity and temperature fluctuations were simultaneously measured by a laser-Doppler velocimeter and a cold-film probe. Measurements include turbulent intensities, correlation coefficients of turbulent fluxes and coherence–phase relationships. These turbulent quantities were correlated with the local gradient Richardson number and compared with the values calculated using a spectral-equation model and with other laboratory measurements. In stable conditions, turbulent motions approach wavelike motions, and negative heat and momentum transfer against the mean temperature and velocity gradient occurs in strongly stable stratification.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 130 , May 1983 , pp. 13 - 26
Copyright
© 1983 Cambridge University Press

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