ORGANIZED MOTIONS IN 'PUFFS' IN TRANSITIONAL PIPE FLOW.

P. Bandyopadhyay, A. K.M.F. Hussain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The turbulence production process in a puff in transitional pipe flows has been studied by means of flow visualization. The technique of water soluble dye injection and laser sheet lighting has been employed for visualization. It is found that the upstream laminar fluid enters the relatively slower moving turbulent puff around the pipe center as a jet. This 'jetting-action' generates large-scale ring vortices like that in an axisymmetric mixing layer. These structures then undergo a chaotic breakdown to smaller scales followed by relatively long regions of decay and relaminarization. This formation of ring vortices and their breakdown is a continuous process and seems to be responsible for the self-sustenance of an equilibrium puff as it moves downstream.

Original languageEnglish
Title of host publicationUnknown Host Publication Title
EditorsWen-Jei Yang
PublisherHemisphere Publ Corp
Pages521-525
Number of pages5
ISBN (Print)0891163778
StatePublished - 1985

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