Journal
PHYSICS OF FLUIDS
Volume 22, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3489987
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Funding
- ANR [ANR-07-BLAN-0155-04]
- Agence Nationale de la Recherche (ANR) [ANR-07-BLAN-0155] Funding Source: Agence Nationale de la Recherche (ANR)
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We present an experimental characterization of preferential concentration and clustering of inertial particles in a turbulent flow obtained from Voronoi diagram analysis. Several results formerly obtained from various data processing techniques are successfully recovered and further analyzed with Voronoi tesselations as the main single tool. We introduce a simple and nonambiguous way to identify particle clusters. We emphasize the maximum preferential concentration for particles with Stokes numbers around unity and the self-similar nature of clustering and we report new unpredicted results concerning clusters inner concentration dependence on Stokes number and global seeding density. Some of these experimental observations can be consistently interpreted in the context of the so-called sweep-stick mechanism. Finally, we stress the great potential of Voronoi analysis that offers important openings for new investigations of particle laden flows in terms, for instance, of simultaneous Lagrangian statistics of particle dynamics and local concentration field. (C) 2010 American Institute of Physics. [doi:10.1063/1.3489987]
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