Droplets generated in T-junction microchannels have characteristics of being monodispersed in the continuous phase. While the flow patterns of slug formation has been studied widely in test systems, the formation process for other patterns like drop, throat annular, parallel and other forms are not well explored. Flow patterns in turn are important for understanding the transport phenomena. In the present work, two phase CFD simulations have been carried out for different velocities of water and ionic liquids. The interface has been tracked using the Volume of Fluid (VOF) approach. The process of neck-formation of the droplet and subsequent breakage was found to be different in each of the regimes. The dependence of transport phenomena on parameters depending of the regimes have been correlated. Though the volumetric mass transfer coefficient was found to be a strong function on dimensionless numbers Pa and Gn the interfacial area depended on flow regimes. In slug flow regime, the volumetric mass transfer was dependent on the interfacial area of the slug length while in drop flow regime it was dependent on that of the drop size. Circulation cells inside and outside the dispersed and continuous phase have also been demonstrated.
