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

I. Wygnanski, M. Sokolov, D. Friedman

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)283-304
Number of pages22
JournalJournal of Fluid Mechanics
Issue number2
StatePublished - May 1975


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