Experimental scaling law for the sub-critical transition to turbulence in plane Poiseuille flow

We present an experimental study of transition to turbulence in a plane Poiseuille flow. Using a well-controlled perturbation, we analyse the flow using extensive Particule Image Velocimetry and flow visualisation (using Laser Induced Fluorescence) measurements and use the deformation of the mean ve...

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Bibliographic Details
Published inarXiv.org
Main Authors Lemoult, Grégoire, Aider, Jean-Luc, José-Eduardo Wesfreid
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 30.11.2011
Subjects
Amplitudes
Deformation
Flow visualization
Fluid dynamics
Fluid flow
Laminar flow
Laser induced fluorescence
Perturbation methods
Physics - Fluid Dynamics
Reynolds number
Scaling laws
Turbulence
Turbulent flow
Velocimetry
Velocity distribution
Velocity measurement
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Summary:We present an experimental study of transition to turbulence in a plane Poiseuille flow. Using a well-controlled perturbation, we analyse the flow using extensive Particule Image Velocimetry and flow visualisation (using Laser Induced Fluorescence) measurements and use the deformation of the mean velocity profile as a criterion to characterize the state of the flow. From a large parametric study, four different states are defined depending on the values of the Reynolds number and the amplitude of the perturbation. We discuss the role of coherent structures, like hairpin vortices, in the transition. We find that the minimal amplitude of the perturbation triggering transition scales like Re^-1.
ISSN:2331-8422
DOI:10.48550/arxiv.1111.7102