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On the spatial distribution of small heavy particles in homogeneous shear turbulence
Sapienza University of Rome.
CNR-INSEAN.ORCID iD: 0000-0002-9989-8206
Sapienza University of Rome.
2013 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 25, no 8, article id 083301Article in journal (Refereed) Published
Abstract [en]

We report on a novel experiment aimed at investigating the effects induced by a large-scale velocity gradient on the turbulent transport of small heavy particles. To this purpose, a homogeneous shear flow at Reλ = 540 and shear parameter S* = 4.5 is set-up and laden with glass spheres whose size d is comparable with the Kolmogorov lengthscale η of the flow (d/η ≈ 1). The particle Stokes number is approximately 0.3. The analysis of the instantaneous particle fields by means of Voronoï diagrams confirms the occurrence of intense turbulent clustering at small scales, as observed in homogeneous isotropic flows. It also indicates that the anisotropy of the velocity fluctuations induces a preferential orientation of the particle clusters. In order to characterize the fine-scale features of the dispersed phase, spatial correlations of the particle field are employed in conjunction with statistical tools recently developed for anisotropic turbulence.The scale-by-scale analysis of the particle field clarifies that isotropy of the particle distribution is tendentially recovered at small separations, even though the signatures of the mean shear persist down to smaller scales as compared to the fluid velocity field.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2013. Vol. 25, no 8, article id 083301
Keywords [en]
Preferential Concentration, Isotropic Turbulence, Inertial Particles, Aerosol-Particles, Boundary-Layer, Flow, Dispersion, Collision, Accelerations, Statistics
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223699DOI: 10.1063/1.4816701ISI: 000323946200027Scopus ID: 2-s2.0-84883321580OAI: oai:DiVA.org:kth-223699DiVA, id: diva2:1186552
Note

QC 20180301

Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-03-26Bibliographically approved

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