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Dispersion of passive particles by a quasi-two-dimensional turbulent flow
Sokolov, Igor M., 1958-; Reigada Sanz, Ramon
Universitat de Barcelona
Using the experimental data of Paret and Tabeling [Phys. Rev. Lett. 79, 4162 (1997)] we consider in detail the dispersion of particle pairs by a two-dimensional turbulent flow and its relation to the kinematic properties of the velocity field. We show that the mean square separation of a pair of particles is governed by rather rare, extreme events and that the majority of initially close pairs are not dispersed by the flow. Another manifestation of the same effect is the fact that the dispersion of an initially dense cluster is not the result of homogeneously spreading the particles within the whole system. Instead it proceeds through a splitting into smaller but also dense clusters. The statistical nature of this effect is discussed.
2011-07-26
Dinàmica de fluids
Física estadística
Termodinàmica
Fluid dynamics
Statistical physics
Thermodynamics
(c)American Physical Society, 1999
Article
The American Physical Society
         

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