Ultra-quick dynamics and acrobatics of viscous marbles
Abstract
Abstract Non-wetting viscous drops are unusually quick compared to wetting ones, owing to the conjunction of non-wetting (which minimizes the contact with the substrate) and rotation (which minimizes the dissipation inside the liquid). Here, we report the existence of a threshold in driving force above which the speed of these objects increases about tenfold compared to previous models and experiments. We find that this effect is due to a dynamic reduction of the contact, that minimizes even more the interaction with the substrate but can also render the dynamics non-stationary – a consequence of the geometrical transformations of fast revolving drops. Paradoxically, viscosity enables this regime by impeding rapid contact equilibration, thereby reducing substrate interactions in fast-moving drops.
Article Details
Authors (5)
Auriane Huyghues Despointes
Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, École Supérieure de Physique et Chimie Industrielles-Paris
Yui Takai
Department of Mechanical Engineering, School of Engineering, The University of Tokyo
Shoko Ii
Timothée Mouterde
Department of Mechanical Engineering, School of Engineering, The University of Tokyo
David Quéré
Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, École Supérieure de Physique et Chimie Industrielles-Paris