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The relationship between the vortical structure and the wall shear stress in a blind trough cavity subject to a jet impingement
Author(s) -
Knob M.,
Uruba V.
Publication year - 2008
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200810621
Subject(s) - mechanics , vortex , jet (fluid) , reynolds number , entrainment (biomusicology) , shear stress , physics , instability , turbulence , wake , classical mechanics , acoustics , rhythm
In a blind trough cavity subject to a jet– impingement, the jet switching phenomenon has been known for decades. The large vortices, formed by the Kelvin– Helmholtz instability play a crucial role in this phenomenon– they are the main cause of the fluid entrainment phenomenon, which consequently evoke the Coanda effect and finally results in the jet switch. As the jet swings, the vortical structure inside the cavity changes together with the impinigement point. The aim of this article is to describe the relationship between the wall shear stress, i.e. the motion of the impingement point, and the vortical structure.The analysed data were obtained using the TR PIV system, the caity aspect ratios 16:24 and 18:24, jet hydraulic diameter based Reynolds numbers 3000, 11200 and 19600, and the impingement angles 0°, 5°, 10° and 15°. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)