Bubble fragmentation dynamics in a subsonic Venturi tube for the design of a compact microbubble generator

Microbubble generators are in wide demand industry following the discovery of a number new functions microbubble mixtures. This paper deals with Venturi tube generator which air bubbles at inlet fragmented diverging part tube. In contrast past studies, we here regulated flow subsonic so that fragmentation occurred without help pressure shock waves. Counting microbubbles image processing, found single bubble into 20–400 depending on Weber number. The power efficiency is to range from 30 50 percent and insensitive liquid viscosity. mechanism elucidated adopting particle tracking velocimetry, association theoretical description translational motion shape oscillation bubble. key event was be bubble's rapid slip-back due positive gradient. provides function prevents large being released