Marangoni Instability and Interfacial Turbulence; the Story of a Liquor’s Birth

Marangoni Instability and Interfacial Turbulence; the Story of a Liquor’s Birth Sami Yamanidouzisorkhabi, MIT Gareth H. McKinley, MIT Irmgard Bischofberger, MIT DOI: Water and ethanol are fully miscible, while anise oil and ethanol are partially miscible and anise oil and water are immiscible. Mixing of all three liquids; however, result in an equilibrium state emulsion of anise microdroplets in water/ethanol solution. Here, we study the mixing of a water drop at the interface of anise oil and ethanol until the equilibrium emulsion state is achieved. We use a combination of regular imaging and Schlieren imaging to visualize the mixing phenomenon. This mixing involves two processes: (i) introduction of a water drop at the anise oil/ethanol interface, Marangoni isntability on the surface of the drop resulting in drop jump, and formation of natural convection caused by exothermic mixing of water and ethanol, (ii) formation of a liquid lens at the interface and it