Abstract
This paper describes the deformation mechanism, breakup type, and critical breakup condition of liquid bubbles due to air streams. Experiments are conducted using a horizontal air-suction wind tunnel. The breakup processes of liquid bubbles are photographed using two stroboscopes with a short time interval. The breakup pattern of liquid bubbles varies with airstream velocity, equivalent diameter, and dimensionless liquid film thickness of a liquid bubble. The breakup conditions of liquid bubbles are shown using the relationship between the equivalent diameter and the relative velocity ; equivalent diameter and Weber number for a liquid bubble. The critical Weber number for a liquid bubble increases with the decreasing equivalent diameter. The critical breakup pattern of a liquid bubble due to an airstream is the bursting of a thin liquid film facing to the wake area.
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