Abstract

In this work, we have investigated numerically the formation of stable Janus droplets in microfluidics flow focusing device. We have examined the effect of continuous phase capillary number (Ca) as it influences the drop size and the stability of a Janus drop for a fixed dispersed phase flow rate. The effect of flow rate ratio of disperse phases has also been examined to understand the relative distribution of the material in a single Janus droplet. Numerical simulations have been performed using the commercial software Ansys Fluent 19.2 with the Volume of Fluid (VOF) method to solve discrete versions of governing equations. We have extended our method to study the formation and stability of a ternary droplet. For this, a third inlet is incorporated at the middle of the initial channel geometry and fluid combination. In the case of ternary drop, we find that different phases re-arrange themselves after drop formation before reaching the final stable configuration.

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