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In an ultrasonic field the region around a solid particle experiences small,localised velocity, pressure, and thermal fluctuations that decay rapidly overshort length scales. Herein, we investigate the overlap of the rapidly decayingfields between two silica particles in water in the case where the particlesare aligned with each other in the direction of the applied field. We explorethe velocity, pressure, temperature, and vorticity in the region of theparticles. We discuss the coupled particle effects in ultrasonic waves asparticles begin to agglomerate or become more concentrated. The analysis isconducted in the long wavelength regime for particles of diameter 500 nm andfrequency 9.7 MHz.

Boundary layer coupling of solid particles in water in an ultrasonic field