Acoustic streaming is the formation of a steady fluid motion promoting agitation and mixing in the liquid.

Acoustic streaming generated from a 20 kHz source was experimentally measured using Particle Image Velocimetry (PIV) and numerically predicted in water. The numerical model was subsequently applied to liquid aluminium considering the effect of cavitating bubbles for the first time. Results showed that volume bubble fraction and sonication power regulates the upward or downward flow of the acoustic streaming.