Dispersion of overdamped diffusing particles in channel flows coupled to transverse acoustophoretic potentials: Transport regimes and scaling anomalies

Massimiliano Giona, Fabio Garofalo

Research output: Contribution to journalArticlepeer-review

Abstract

We address the dispersion properties of overdamped Brownian particles migrating in a two-dimensional acoustophoretic microchannel, where a pressure-driven axial Stokes flow coexists with a transverse acoustophoretic potential. Depending on the number and symmetries of the stable nodal points of the acoustophoretic force with respect to the axial velocity profile, different convection-enhanced dispersion regimes can be observed. Among these regimes, an anomalous scaling, for which the axial dispersion increases exponentially with the particle Peclet number, is observed whenever two or more stable acoustophoretic nodes are associated with different axial velocities. A theoretical explanation of this regime is derived, based on exact moment homogenization. Attention is also focused on transient dispersion, which can exhibit superballistic behavior <(x - < x >)(2 >) similar to t(3), x being the axial coordinate.
Original languageEnglish
Article number032104
JournalPhysical Review E (Statistical, Nonlinear, and Soft Matter Physics)
Volume92
Issue number3
DOIs
Publication statusPublished - 2015

Subject classification (UKÄ)

  • Fluid Mechanics and Acoustics

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