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On transition in a pipe. Part 2. The equilibrium puff

Published online by Cambridge University Press:  29 March 2006

I. Wygnanski ,
M. Sokolov  and
D. Friedman
I. Wygnanski
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
M. Sokolov
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
D. Friedman
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
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Abstract

Conditionally sampled hot-wire measurements were taken in a pipe at low Reynolds numbers (2700 > Re > 2000) corresponding to the onset of turbulence as a result of a large perturbation in the flow. This type of transition gives rise to a turbulent puff which maintains itself indefinitely at around Re = 2200. The structure of puffs was investigated in some detail and was found to be very different from the structure of fully developed turbulent pipe flow. Nevertheless, it is independent of the character of the disturbance which created it. The purpose of the study was to gain some insight into the mechanism of transition in a pipe.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 69 , Issue 2 , 27 May 1975 , pp. 283 - 304
Copyright
© 1975 Cambridge University Press

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References

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Kovasznay, L. S. G. 1971 AGARD Specialists Meeting on Turbulent Shear Flow, reprint no. 93.
Lindgren, E. R. 1957 Arkiv Fys. 12, 1–69.
Valerani, E. 1964 Engineers thesis, Guggenheim Aero. Lab., California Institute of Technology.
Wygnanski, I. J. & Champagne, F. H. 1973 J. Fluid Mech. 59, 281–335.