77th Annual Meeting of the APS Division of Fluid Dynamics (November 24, 2024 — November 26, 2024)
P2684824: Permeable Droplets and Jets in Microchannels
DOI: https://doi.org/10.1103/APS.DFD.2024.GFM.P2684824
It is often said that water and oil do not mix. In the presence of a solvent, which is miscible in both phases, however, significant mass transfer is observed during the formation of droplets and jets in another liquid. Here, we investigate the different aspects of the natural phenomenon of spontaneous emulsification using forced convection when a solvent is initially blended with an oil phase to form a solvent-rich or conjugate oil and contacts an aqueous phase in square coaxial microfluidic channels. Flow-based methods are employed to unravel out-of-equilibrium fluid interactions and the complex physics of ternary fluid systems at short timescales. The presented micrographs reveal, in particular, the interplay between capillary and diffusive phenomena in microgeometries using common fluids, including water or ethanol for the aqueous phase, isopropanol for the solvent, and silicone oil.
This work is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License. Any reuse must credit the author(s) and provide a link back to this page.