Abstract
In the present study, the incipient mechanism of traveling bubble cavitation and the relation with the water quality were investigated experimentally. A nozzle-type venturi tube was used to make a single bubble cavitation. The incipient and growing process of a single bubble was experimentally observed at various positions of the nozzle throat. At the same time, a rapid change in bubble diameter during the collapsing period was seen compared with that of the growing period. The collapsing pattern of the various shapes was confirmed by the high-speed video observation. The action of rebound motion as well as a micro-jet and a torus deformation of bubble were observed. The inception of a single bubble cavitation was measured in different dissolved oxygen contents, and it was confirmed that the count rate of bubble inception varies stochastically.
