Abstract
In the present study one of the effective techniques for micro-bubble generation by using converging-diverging nozzle (venturi tube) is introduced. Rapid pressure recovery in the diverging area induces bubble fission. The purpose of the present study is to clarify the mechanism of the bubble breakup. The results suggest that micro-bubbles are generated by the bubble fission in the case of the cavitation number of less than 1.0. By using a high-speed camera, several kinds of bubble breakup phenomena were observed in detail.
