Do finite-size neutrally buoyant particles cluster?
Les paticules iso-denses forment-elles des amas ?
Fiabane, L. ; Volk, R. ; Pinton, J.F. ; Monchaux, R. ; Cartellier, A. ; Bourgoin, M.
Type de document
Article de revue scientifique à comité de lecture
Affiliation de l'auteur
IRSTEA RENNES UR TERE FRA ; LABORATOIRE DE PHYSIQUE ENS DE LYON UMR CNRS 5672 LYON FRA ; LABORATOIRE DE PHYSIQUE ENS DE LYON UMR CNRS 5672 LYON FRA ; ENSTA PARIS TECHN UNITE DE MECANIQUE PARIS FRA ; LEGI UMR CNRS 5519 UNIVERSITE JOSEPH FOURIER GRENOBLE FRA ; LEGI UMR CNRS 5519 UNIVERSITE JOSEPH FOURIER GRENOBLE FRA
Résumé / Abstract
The turbulent mixing of small and heavy particles presents a striking feature known as preferential concentration or clustering. We investigate here the preferential concentration of particles that are neutrally buoyant but with a diameter significantly larger than the dissipation scale η of the carrier flow (4.4η–17η). Such particles are known to not behave as flow tracers (Qureshi et al 2007 Phys. Rev. Lett. 99 184502) but it remains an open question whether they do cluster or not. For this purpose, we produce homogeneous and isotropic turbulence in a closed water flow, and seed the flow with neutrally buoyant particles spanning a range of Stokes numbers from 1.6 to 24.2 depending on the rotation frequency. The spatial structuration of these inclusions is then investigated by Voronoï tesselation analysis, as proposed recently by Monchaux et al (2010 Phys. Fluids 22 103304), from images of the particle concentration field taken in a laser sheet at the center of the flow. No matter what the rotation frequency and the Reynolds and Stokes numbers are, the particles are found to not cluster. Finite-size neutrally buoyant particles are therefore not inertial. We also conclude that the Stokes number per se is an insufficient indicator of the clustering trend in particles-laden flows.
Physica Scripta, vol. T155, 6 p.