Universality of stretching separation

Abstract

We develop a parameter-free model for the fragmentation of drops colliding off-center. The prediction is excellent over a wide range of liquid properties. The so-called stretching separation is attributed to the extension of the merged drop above a critical aspect ratio of {3.25}. The evolution of this aspect ratio {is influenced by the liquid viscosity} and can be interpreted via an energy balance. This approach is then adapted to drop-jet collisions, which we model as consecutive drop-drop collisions. {The fragmentation criterion is similar the one observed at drop-drop collisions}, while the evolution of the stretched jet aspect ratio is modified to account for the different flow fields and geometry.

11 pages, 4 figures and supplementary material

References in corpus (5)

• On the spreading of impacting drops
• In-air microfluidics enables rapid fabrication of emulsions, suspensions, and 3D modular (bio)materials
• Effects of viscosity on liquid structures produced by in-air microfluidics
• Influence of liquid miscibility and wettability on the structures produced by drop-jet collisions
• Drop Stream - Immiscible Jet Collisions: Regimes and Fragmentation Mechanisms