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We present an experimental study of a droplet interacting with an ultrasonicsurface acoustic wave (SAW). Depending on the amplitude of the wave, the dropcan either experience an internal flow with its contact-line pinned, or (athigher amplitude) move along the direction of the wave also with internal flow.Both situations appear together with oscillations of the drop free-surface. Thephysical origins of the internal mixing flow as well as the drop displacementand surface waves are still not well understood. In order to give insights ofthe underlying physics involved in these phenomena, we carried out anexperimental and numerical study. The results suggest that the surfacedeformation of the drop can be related as a combination between acousticstreaming effect and radiation pressure inside the drop.

Droplets displacement and oscillations induced by ultrasonic surface acoustic waves: a quantitative study