Some issues on turbulent mixing and turbulence

Creators: Dimotakis, Paul E.

Abstract

Recent data on turbulent mixing suggest that the mixing transition, previously documented to occur in shear layers, also occurs in jets, as well as many other flows, and can be regarded as a universal phenomenon. The resulting, fully-developed turbulent flow requires a minimum Reynolds number of Re_T ≈ 10^4, or a Taylor Reynolds number of Re_T ≈ 10^2 to be sustained. Turbulent mixing in this fully-developed state does not appear to be universal, however, with a qualitatively different behavior between shear layers and jets.

Additional Information

© 1993 California Institute of Technology. Presented at the Turbulence Symposium in honor of W. C. Reynolds' 60th birthday 22-23 March 1993, Monterey, California GALCIT Report FM93-1A. 17 March 1993 Revised: 6 July 1993. The work described here is part of a larger program at Caltech to study mixing and chemically reacting turbulent flows and the result of the efforts, collaboration, and discussions of many people over the years. In the context of the material presented in this paper, I would specifically like to acknowledge the work and discussions with Paul L. Miller, on turbulent jet mixing, and Chris L. Bond, who recalculated many of the data points in Figs. 8 from the original measurements. This work was supported by the Air Force Office of Scientific Research, Grant Nos. 88-0155, 90-0304, and F49620-92-J-0290, and the Gas Research Institute Contract NO. 5087-260-1467.

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