Effect of Cavitation Phenomenon on Bubble Collapse in Venturi Tube

Abstract

Microbubbles have various properties and are expected to be used in a wide range of fields. Although there are various generation methods, the generation method using a Venturi tube is a simple system and has attracted attention. However, the flow in the Venturi tube is very complex and has not been elucidated. The purpose of this paper is to clarify the effect of the cavitation phenomenon on the generated bubbles. In the visualization experiment, the cavitation phenomenon in which bubbles are generated and disappeared in the throat in the liquid single-phase flow was confirmed. It was possible to evaluate the occurrence of cavitation in the bubble flow by using the pressure loss coefficient. Furthermore, it was confirmed that the bubbles were further refined under the cavitation generation conditions.