Can aerosols be trapped in open flows?

Details Can aerosols be trapped in open flows? Can aerosols be trapped in open flows?

2007-06-10

arxiv.org/abs/0706.1336v2

Phys. Rev. Lett. 99, 264101 (2007)

Nonlinear Sciences

Chaotic Dynamics

Animation available at http://www.pks.mpg.de/~rdvilela/leapfrogging.html

Scientific paper

10.1103/PhysRevLett.99.264101

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.

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