Colliding droplets are ubiquitous in everyday technologies such as combustion engines and sprays, and in natural processes such as raindrops and in cloud formation. The collision outcomes depend on the velocity of impact, degree of alignment, intrinsic properties of surface tension and a low-wetting surface. In a new report on Science Advances, Olinka RamÃrez-Soto and a team of scientists in polymer research, fluid dynamics, chemical and materials engineering in Germany, Netherlands and the U.S. investigated the dynamics of an oil drop impacting an identical sessile droplet on a superamphiphobic surface. A superamphiphobic surface is analogous to superhydrophobicity (water repellence), although it can repel both polar and nonpolar liquids. Using numerical simulations, the team recreated rebound scenarios to quantify the velocity profiles, energy transfer and viscous dissipation in the experimental setup. This work showed the influence of impact velocity on rebound dynamics for oil drop-on-drop collisions on superamphiphobic surfaces.
Click here for original story, Lifting a sessile drop from a superamphiphobic surface using an impacting droplet
Source: Phys.org