The turbulent mixing layer with an asymmetrical distribution of temperature

Author:

Béguier Claude,Fulachier Louis,Keffer James F.

Abstract

An experimental programme has been carried out to examine the spread of heat as a passive scalar contaminant in a turbulent shear flow. The situation involves a slightly heated two-dimensional jet expanding into a quiescent medium on one side and a uniform stream with velocity equal to that of the warm jet on the other. Thus the developed flow is a typical mixing layer with an asymmetric mean temperature profile superimposed on it. Measurements of the mean and fluctuating velocity and temperature fields show the existence of a region where the production of temperature fluctuations is negative. Spectral analysis in this zone indicates a separation of large and small wavenumber components of the cospectrum into two regimes. The sign of the high-frequency portion is consistent with gradient-transport concepts while the low-frequency component is of opposite sign. From this it is inferred that the large eddies are mainly responsible for the negative production. A mathematical model has been developed to describe the transport within this region.

Publisher

Cambridge University Press (CUP)

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics

Reference38 articles.

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2. Wilson, D. J. 1974 Phys. Fluids 17,674.

3. Béguier, C. 1965b C. R. Acad. Sci. Paris A260, 5460.

4. Keffer, J. F. , Olsen, G. F. & Kawall, J. G. 1977 J. Fluid Mech. 79,595.

5. Dumas, R. , Fulachier, L. & Arzoumanian, E. 1972 C. R. Acad. Sci. Paris A274, 267.

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