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The effect of spatial restriction on the inner-layer structure of wall turbulence

Published online by Cambridge University Press:  21 April 2006

Shigeo Maruyama
Affiliation:
Department of Mechanical Engineering, 1, Bunkyo-ku, Tokyo 113, Japan
Hiroaki Tanaka
Affiliation:
Department of Mechanical Engineering, 1, Bunkyo-ku, Tokyo 113, Japan

Abstract

Hot-film-anemometer measurements were carried out in a shear flow between a flat plate and a moving plate fitted with an array of tall fences. The effect of spatial restriction by the fences on the inner-layer structure of the boundary layer developing on the flat-plate side was investigated. It was revealed that the inner-layer structure was maintained even when the tips of the fences were passing at a distance y+ = 45 from the flat plate; the flow did not become laminar-like until the tips reached y+ = 25. These results suggested the physical view that the inner layer of wall turbulence has a tough, self-sustaining structure, which is uniquely determined under a given mean wall shear stress and is hardly influenced by outer-layer disturbances provided that its own spatial extent of about 45 ν/u* from the wall is maintained.

Type
Research Article
Copyright
© 1987 Cambridge University Press

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