Micro PIV analysis of secondary vortices with observations of primary vortices in single bubble cavitation microstreaming

Abstract

Cavitation microstreaming and Micro-PIV (Particle Image Velocimetry), the imaging techinques used to capture the flows, have gained increasing interest due to innovative medical treatments. Previous studies in microstreaming have focused entirely on the secondary flows, in the present study a novel technique has been used to capture the primary flow, within the Stokes layer, as well as studying significantly smaller bubbles. The speed of the flow within the Stokes layer is at least an order of magnitude larger than the secondary flows. Further-more smaller bubbles tended to have shape irregularities which greatly affect the flow patterns produced.