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Venturi-type bubble generators have wide application in general and chemical industry. There are few researches about process and mechanism of bubble breakup inside generators. Previous studies showed that large bubbles were rapidly decelerated after entered diverging section of a Venturi-type bubble generator

which was probably critical to bubble breakup process. In this paper

large-eddy simulation on flow in a Venturi-type bubble generator showed existence of an obvious vortex region near wall of the diverging section. A strong collision between front of the vortex region and fluid from upstream fast decelerated fluid upon entering the region and significantly increased static pressure near confluence of vortex region and mainstream. When a bubble was moving through the region

it would be greatly decelerated by a surge in pressure gradient force and mass-added force

which intensified interaction with ambient fluid. Under a high liquid velocity condition

the bubble could be severely deformed and even broken..