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Forced Rayleigh scattering in turbulent plane Poiseuille flows. Part 1. Study of the transverse velocity-gradient component

Published online by Cambridge University Press:  21 April 2006

M. Cloitre  and
E. Guyon
M. Cloitre
Affiliation:
Laboratoire d'Hydrodynamique et de Mécanique Physique, UA CNRS/857, ESPCI, 10, rue Vauquelin-75231 PARIS CEDEX 05
E. Guyon
Affiliation:
Laboratoire d'Hydrodynamique et de Mécanique Physique, UA CNRS/857, ESPCI, 10, rue Vauquelin-75231 PARIS CEDEX 05
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Abstract

In this article, we describe an optical set-up designed to measure directly velocity gradients (strophometry). This strophometer is based on the analysis of the distortions of a fringe pattern ‘written’ instantaneously in a flow field. We apply it to study the transverse velocity-gradient component ∂u/∂y in a plane Poiseuille flow at moderate Reynolds numbers. Mean values and different moments of the fluctuating gradient distribution related to viscous dissipation, vorticity dynamics and intermittency are obtained. These results are interpreted in terms of the large-scale structures which are present in the flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 164 , March 1986 , pp. 217 - 236
Copyright
© 1986 Cambridge University Press

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