Turbulent transport of material particles: an experimental study of finite size effects

We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The glob...

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Bibliographic Details
Published in:Physical review letters 2007-11, Vol.99 (18), p.184502-184502, Article 184502
Main Authors: Qureshi, Nauman M, Bourgoin, Mickaël, Baudet, Christophe, Cartellier, Alain, Gagne, Yves
Format: Article
Language:English
Subjects:
Engineering Sciences
Fluid mechanics
Fluids mechanics
Mechanics
Physics
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Summary:We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The global shape of the particle's acceleration probability density functions is not found to depend significantly on its size while the particle's acceleration variance decreases as it becomes larger in quantitative agreement with the classical k(-7/3) scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.184502