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Studies of the wall shear stress in a turbulent pulsating pipe flow

Published online by Cambridge University Press:  21 April 2006

Zhuo-Xiong Mao
Affiliation:
University of Illinois, Urbana, Illinois 61801, USA
Thomas J. Hanratty
Affiliation:
University of Illinois, Urbana, Illinois 61801, USA

Abstract

Measurements are presented of the time variation of the wall shear stress caused by the imposition of a sinusoidal oscillation on a turbulent pipe flow. The amplitude of the oscillation is small enough that a linear response is obtained and the dimensionless frequency, ω+ = ων/u*2, is large compared with that studied by most previous investigators. The most striking feature of the results is a relaxation effect, similar to that observed for flow over a wavy surface, whereby the phase angle characterizing the temporal variation of the wall shear stress undergoes a sharp change over a rather narrow range of ω+. At ω+ larger than the median frequency of the turbulence there appears to be an interaction between the imposed flow oscillation and the turbulence fluctuations in the viscous sublayer, which is not described by present theories of turbulence.

Type
Research Article
Copyright
© 1986 Cambridge University Press

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