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Intermittency and preferential transport of heat in a round jet

Published online by Cambridge University Press:  19 April 2006

R. Chevray  and
N. K. Tutu
R. Chevray
Affiliation:
Department of Mechanical Engineering, State University of New York, Stony Brook
N. K. Tutu
Affiliation:
Department of Mechanical Engineering, State University of New York, Stony Brook Present address: Department of Aeronautical Engineering Sciences, University of Colorado, Boulder, Colorado 80302.
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Abstract

The temperature and velocity fields in a round heated jet were investigated in detail. Both conventional measurements and conditional measurements (zone averages and point averages) were performed. The probability density functions of the lengths of turbulent and non-turbulent durations were also measured. Filtered correlation measurements show that large-scale turbulent motions were responsible for the bulk of momentum and heat transport, and also that small scales were more efficient in transporting heat than in transporting momentum. In no case was heat transported further or more than momentum, however. These results are discussed in detail, particularly with regard to the entrainment. Conservation equations for turbulent-zone variables and the intermittency factor are derived and a model for some of the resulting higher-order correlations is suggested. An exact equation for the intermittency function is presented.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 88 , Issue 1 , 13 September 1978 , pp. 133 - 160
Copyright
© 1978 Cambridge University Press

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