Drop splashing is independent of substrate wetting
arXiv:1607.08867 · doi:10.1063/1.5012529
Abstract
A liquid drop impacting a dry solid surface with sufficient kinetic energy will splash, breaking apart into numerous secondary droplets. This phenomenon shows many similarities to forced wetting, including the entrainment of air at the contact line. Because of these similarities and the fact that forced wetting has been shown to depend on the wetting properties of the surface, existing theories predict splashing to depend on wetting properties as well. However, using high-speed interference imaging we observe that at high capillary numbers wetting properties have no effect on splashing for various liquid-surface combinations. Additionally, by fully resolving the Navier-Stokes equations at length and time scales inaccessible to experiments, we find that the shape and motion of the air-liquid interface at the contact line at the edge of the droplet are independent of wettability. We use these findings to evaluate existing theories and to compare splashing with forced wetting.
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Cited by in corpus (7)
- Lifting a sessile oil drop from a superamphiphobic surface with an impacting one
- The role of drop shape in impact and splash
- Post collision hydrodynamics of droplets on cylindrical bodies of variant convexity and wettability
- Droplet Splashing on Rough Surfaces
- Simulations of splashing high and low viscosity droplets
- Observation of the pressure effect in simulations of droplets splashing on a dry surface
- Drop Impact Dynamics of Complex Fluids: A Review