Time-resolved Particle Image Velocimetry of the flow in an acoustic standing wave tube

The flow field in an acoustic standing wave tube was measured using time-resolved particle image velocimetry (PIV). Verifications were made through comparisons between measured and predicted acoustic particle velocities in the spatial domain and the time domain. The accuracy of the time-resolved PIV system was satisfactory, at least for the periodic flow velocity component. The steady streaming flow field was then obtained through synchronous data acquisition. The streaming flow featured recirculation patterns which were different from classical Rayleigh or Schlichting streaming patterns. One possible reason is that the streaming Reynolds number was too low for classical streaming to occur.