Monodispersed microbubble production using modified micro-Venturi bubble generator

This paper presents an innovative method to produce controlled monodispersed bubbles using a modified micro-Venturi channel. The influence of flow control parameters such as liquid pressure and gas flow rate on the controlled generation of micro-bubbles was investigated. Experiments were conducted in a transparent modified micro-Venturi channel, having a depth of 40 μm, in which monodispersed gas bubbles were generated. The proposed design provides a new configuration to produce monodispersed microbubbles. Image analysis focused at the vena-contracta region showed that the geometry of generated microbubbles change suddenly from an ellipsoidal shape to a circular shape having a constant diameter. The dynamics of the bubble breakup mechanism in a modified micro-Venturi channel has been described. It was observed that the velocity and the size of the micro-bubbles were strongly dependent on the flow control parameters. The bubble frequency was linearly increasing with respect to gas mass flow rates.