Rising droplets in a centrifugal field: A way to avoid interfacial contamination in liquid-liquid flow

Substituting a centrifugal field to gravity makes possible the study of the dynamics of rising deformable drops in another immiscible liquid, keeping free from contamination of the interface. In this experiment, impurities do not have time to adsorb during the very short residence time due to the strong acceleration. Experiments are used to validate direct numerical simulation results in liquid-liquid systems, and the aspect ratio of rising ellipsoidal droplets is found to be a growing function of the sole Weber number, with a smaller rate compared to clean bubbles.