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Temperature fluctuations and heat flux in grid-generated isotropic turbulence with streamwise and transverse mean-temperature gradients

Published online by Cambridge University Press:  20 April 2006

R. Budwig ,
S. Tavoularis  and
S. Corrsin
R. Budwig
Affiliation:
Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218 Present address: Department of Mechanical Engineering, University of Idaho, Moscow, Idaho, 83843 U.S.A.
S. Tavoularis
Affiliation:
Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario K1N 6N5
S. Corrsin
Affiliation:
Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
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Abstract

A screen of closely spaced, parallel, thin wires was placed downstream of a grid generating nearly isotropic turbulence. The screen was normal to the flow and was heated in one of two modes: (1) periodically in time, to generate a train of transversely uniform streamwise thermal ramps, each with a uniform streamwise gradient, and (2) steadily, with transverse non-uniformity, to generate a uniform transverse thermal ramp. The simple temperature and temperature-gradient fluctuation statistical properties in both cases were found to be comparable to those encountered in earlier works with a steadily heated grid producing a uniform transverse thermal ramp. In both modes of heating the temperature fluctuations decreased initially behind the screen and then increased monotonically. The turbulent-heat-transfer correlation coefficient attained an asymptotic magnitude between 0.7 and 0.8 for both modes of heating. The skewness of the temperature-fluctuation derivative in the direction of the mean gradient was founded to be non-zero despite the absence of mean shear.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 153 , April 1985 , pp. 441 - 460
Copyright
© 1985 Cambridge University Press

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