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APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 8
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Phys. Rev. Lett. 101, 084504 (2008) [4 pages]

Quantifying Turbulence-Induced Segregation of Inertial Particles

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Enrico Calzavarini1,*, Massimo Cencini2, Detlef Lohse1, and Federico Toschi3 (International Collaboration for Turbulence Research)
1Department of Applied Physics, JMBC Burgers Center for Fluid Dynamics, and IMPACT Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
2INFM-CNR, SMC Department of Physics, Università “La Sapienza,” Piazzale Aldo Moro 2, 00185 Roma, Italy, and CNR-ISC, Via dei Taurini 19, 00185 Roma, Italy
3CNR-IAC, Viale del Policlinico 137, 00161 Roma, Italy, and INFN, Sezione di Ferrara, via Saragat 1, 44100 Ferrara, Italy

Received 5 February 2008; published 22 August 2008

Particles with different density from the advecting turbulent fluids cluster due to the different response of light and heavy particles to turbulent fluctuations. This study focuses on the quantitative characterization of the segregation of dilute polydisperse inertial particles evolving in turbulent flow, as obtained from direct numerical simulation of homogeneous isotropic turbulence. We introduce an indicator of segregation amongst particles of different inertia and/or size, from which a length scale rseg, quantifying the segregation degree between two particle types, is deduced.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.084504
DOI:
10.1103/PhysRevLett.101.084504
PACS:
47.27.−i, 47.10.−g

*Present address: École Normale Supérieure de Lyon, CNRS UMR5672, 46 Allée d’ Italie, 69007 Lyon, France.

 
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