Acoustic Lagrangian velocity measurement in a turbulent air jet

Measuring Lagrangian velocities in a turbulent flow is of a great interest for turbulence modeling. We report measurements made in an axisymmetric turbulent air jet at Reynolds number R ? ? 320, using acoustical Doppler scattering. Helium-filled soap bubbles are used as Lagrangian tracers. We descri...

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Bibliographic Details
Published in:Experiments in fluids 2007-03, Vol.42 (3), p.371-384
Main Authors: GERVAIS, P, BAUDET, C, GAGNE, Y
Format: Article
Language:English
Subjects:
Acoustics
Aerodynamics
Computational fluid dynamics
Engineering Sciences
Exact sciences and technology
Fluid dynamics
Fluid flow
Fluid mechanics
Fluids mechanics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Jets
Mathematical models
Mechanics
Physics
Probability density functions
Turbulence
Turbulent flow
Turbulent flows, convection, and heat transfer
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Summary:Measuring Lagrangian velocities in a turbulent flow is of a great interest for turbulence modeling. We report measurements made in an axisymmetric turbulent air jet at Reynolds number R ? ? 320, using acoustical Doppler scattering. Helium-filled soap bubbles are used as Lagrangian tracers. We describe an experimental setup which allows the simultaneous measurement of the full three-component Lagrangian velocity and the longitudinal Eulerian one. Lagrangian velocity probability density functions (PDF) are found Gaussian, close to Eulerian ones. Velocity correlations are analysed as well as the statistical dependence between components.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-006-0245-3