EVOLUTION OF A TURBULENT SPOT IN THE ENTRANCE REGION OF A DUCT.

A. J. Chambers, R. A. Antonia, M. Sokolov

Research output: Contribution to journalConference articlepeer-review

Abstract

The evolution of a spot, generated in one of the laminar boundary layers in the entrance region of a two-dimensional duct, has been studied using ensemble averaged velocity and wall shear stress distributions in the plane of symmetry of the spot. The potential flow field of the spot triggers a second spot on the opposite wall of the duct. This new spot grows quickly until the turbulent regions occupied by the two spots completely fill the width of the duct and then propogates at the same convective velocity as the original spot. This transition mechanism differs significantly from that observed, when a spot is introduced in a plane Poiseuille flow; in this case, the spot fills the duct almost immediately after it is generated.

Original languageEnglish
Pages (from-to)751-758
Number of pages8
JournalPCH. Physicochemical hydrodynamics
Volume6
Issue number5-6
StatePublished - 1984
Externally publishedYes
EventPhysicochem Hydrodyn, 5th Int Conf - Tel Aviv, Isr
Duration: 16 Dec 198421 Dec 1984

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