Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 26: Fluid dynamics II
DY 26.5: Vortrag
Donnerstag, 28. Februar 2008, 15:15–15:30, MA 001
Can aerosols be trapped in open flows? — •Rafael Vilela1 and Adilson Motter2 — 1Max Planck Institute for the Physics of Complex Systems - Dresden — 2Northwestern University, Evanston, IL 60208, USA
The fate of aerosols in open flows is relevant in a variety of physical contexts. Previous results are consistent with the assumption that such finite-size particles always escape in open chaotic advection. Here we show that a different behavior is possible. We analyze the dynamics of aerosols both in the absence and presence of gravitational effects, and both when the dynamics of the fluid particles is hyperbolic and nonhyperbolic. Permanent trapping of aerosols much heavier than the advecting fluid is shown to occur in all these cases. This phenomenon is determined by the occurrence of multiple vortices in the flow and is predicted to happen for realistic particle-fluid density ratios.