Trap and movement of solid particles with use of vortex ultrasonic beam

The problem of trapping and moving in a liquid of solid spherical particles by an ultrasonic beam formed by the 8-element antenna array is solved. Requirements are formulated for the configuration of the ultrasonic field and its intensity for trapping and retaining particles of a given radius and density. Measurements of the acoustic power emitted by individual elements of the array are given and it is shown that the amplitude of the vibrational velocity can be sufficient to trap and retain in water the polystyrene particles of submillimeter size.