A Study on Encapsulated Liquid Drop Formation in Liquid-Liquid-Gas Systems : Fundamental Mechanism of Encapsulated Drop Formation

Abstract

To investigate the critical condition of encapsulated drop formation in liquid-liquid-gas systems, the dynamic behavior of a rising gas bubble across the interface between two immiscible liquids was analyzed experimentally and theoretically. The experiment revealed that an encapsulated liquid drop was formed by a gas bubble passing through the liquid-liquid interface or rebounding from the interface without the rupture of the liquid film between the interface and the gas bubble. A theoretical analysis based on an effective and simple model was developed by considering interface tension and liquid viscosity. The numerical results agreed with the experimental results.