Abstract
Microbubbles are expected to be applied in various fields such as engineering and medical fields. Thus, microbubble generation techniques with high efficiency are required. In the present study, we pay attention to the microbubble generator using a venturi tube (converging-diverging nozzle). This generator has a simple structure and a performance to generate bubbles of several-hundred-micrometer diameter at high void fraction. However, there are several unsolved parts about the bubble miniaturization mechanism. In order to clarify the mechanism of bubble breakup phenomena, we observe bubble fission behavior in a venturi tube in detail. Compared with the pressure distribution in venturi tube, it is suggested that rapid pressure recovery affects bubble collapse.
