Some industrial processes, in their operations, involve the presence of two immiscible liquid phases. The dispersed drops are surrounded by a continuous phase. The drops tend to coalesce with adjacent drops or to join their mother phase separated by an interface. These kind of phenomena occur in many industrial operations as well as in environmental processes. The liquid-liquid foams behaviour ...

In this work, a mechanistic model of drop coalescence based upon a stochastic film-drainage analysis is developed. The coalescence model accounts for previously considered factors, such as turbulence intensity, drop size, and drop deformability, while additionally describing the dual effects of drop surface potential and system electrolyte concentration. Model results indicate that electrostati...

In this dissertation, we present a numerical method for tracking surfactants on an interface in multiphase flow, along with applications of the method to two physical problems. We also present an extension of our method to track charged droplets. Our method combines a traditional volume of fluid (VOF) method with marker tracking. After describing this method in detail, we present a series of te...

We study the dynamics and arrest of two coalescing sessile yield-stress drops. Surprisingly, we find that height bridge evolves similar to a Newtonian fluid. The arrested final coalesced shape is described by balance between capillary pressure yield stress, which predicted from viscoplastic lubrication theory.

We present the results of a combined experimental and numerical investigation of the coalescence of a drop with a liquid reservoir of a miscible but distinct fluid. Particular attention is given to elucidating the influence on the coalescence process of a surface tension difference between drop and reservoir. Drops are gently deposited on the surface of the reservoir, and so coalesce with negli...

Stagewise forward mixing model considering coalescence and redispersion of drops was used to predict the performance of Rotating Disc Liquid-Liquid Extraction Contactors. Experimental data previously obtained in two RDC columns of 7.62cm diameter, 73.6cm height and 21.9cm diameter, 150cm height were used to evaluate the model predictions. Drop-side mass transfer coefficients were predicted appl...

The addition of polymers is known to fundamentally affect capillary singularities such as drop pinch-off. In this study, we wonder how polymeric drops spread onto a solid. Although the dynamics liquid bridge connecting solid similar that pure water, find interface gets significantly sharper, which quantified by measuring curvature bridge. These findings are reminiscent what found for coalescenc...

Drop dynamics plays a central role in defining the interfacial morphology in two-phase complex fluids such as emulsions and polymer blends. In such materials, the components are often microstructured complex fluids themselves. To model and simulate drop behavior in such systems, one has to deal with the dual complexity of non-Newtonian rheology and evolving interfaces. Recently, we developed a ...