Sharif Digital Repository

In this study, the performance of electrocoalescence in a microfluidic device was investigated through numerical simulations. The microfluidic device consisted of two immiscible fluids, a continuous phase, and a dispersed phase, which were modeled as incompressible Newtonian fluids. The interface between the two phases was tracked using a phase-field model. A flow-focusing geometry was employed to crate water droplets in oil. The dispersed droplets were then pass over a set of electrodes. The merging of two adjacent droplets in the microfluidic device was observed by applying a constant electric field. The voltage of 60 V is the lowest voltage at which the regular merging of pairs of drops... 

Droplet coalescence in microfluidic systems plays a crucial role in a wide range of engineering applications. The investigation of droplet coalescence using electric fields is of particular importance due to its high controllability, fast response, and weak dependence on channel geometry and flow rates. In this study, a three-dimensional computational fluid dynamics (CFD) modeling of the electro-coalescence of moving deionized water droplets in mineral oil under the influence of direct and alternating electric fields was performed. In addition, dimensional analysis based on the Buckingham π theorem and phenomenological modeling were conducted to achieve a better understanding of the...