Unstable behaviours of cavities formed by steady planar jets on still water

Abstract

 In this study, local behaviors of cavities formed at impact of a steady planar jet onto still water were measured on the basis of a high-speed, high-resolution back-light imaging technique. The characteristic time and length scales to define deformation of the cavities, depending on the impact velocity, were analyzed to identify the mechanisms of the cavity growth. The both capillary and vortex-induced pressure are found to govern the local cavity behaviors.