Simultaneous measurement of acoustic and streaming velocities using synchronized PIV technique

Abstract

Synchronized particle image velocimetry (PIV) technique has been applied to measure the acoustic and streaming velocity fields simultaneously, inside a standing-wave rectangular channel. In this technique, the velocity fields were sampled at a certain phase of the excitation waveform. The acoustic velocity fields were obtained by cross-correlating the two consecutive PIV images, whereas the streaming velocity fields were obtained by cross-correlating the alternative PIV images at the same phase. The experimental values of the mean acoustic velocity and RMS streaming velocities obtained from PIV are in good agreement with the theoretical values, showing that this novel approach can measure both acoustic and streaming velocities, accurately and simultaneously, in the presence of large amplitude acoustic wave.