Abstract

Acoustic manipulation of fluids and particles garners increasing interest for use in medicine and biotechnology. One approach is based on actuation of confined, acoustically ``leaky'' systems, but finding accurate physical models for them has been stymied by a lack of relevant empirical data. To advance the field, the authors provide experimental benchmark results for particle trajectories in three dimensions, and describe them with a minimal numerical model. They reveal that a pseudo-standing wave drives acoustic streaming and the acoustic radiation force on suspended particles---important insight for developing clinical applications.

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