The objective of this work is to study the fundamental instability behind the crown formation in the problem of drop splashing on a pre-existing liquid film. Based on experimental and theoretical insights, we demonstrate that the most plausible instability mechanism is of the Richtmyer-Meshkov type associated with a nearly impulsive acceleration of the interface. We also discover frustration ph...

After impact onto a smooth dry surface, a drop of viscous liquid initially spreads in the form of a thick lamella. If the drop splashes, it first emits a thin fluid sheet that can ultimately break up into droplets causing the splash. Ambient gas is crucial for creating this thin sheet. The time for sheet ejection, t{ejt}, depends on impact velocity, liquid viscosity, gas pressure, and molecular...

This paper studies systems of partial differential equations modelling laser percussion drilling. The particular phenomenon considered in detail is the ejection of the thin layer of molten material. This thin layer is modelled as an inviscid flow between the fluid surface and fluid/solid interface, both of which are unknown moving boundaries. Through a regular asymptotic expansion, the governin...

This article reports nonintuitive characteristic of a splashing drop on solid surface discovered through extracting image features using feedforward neural network (FNN). Ethanol area-equivalent radius about 1.29 mm was dropped from impact heights ranging 4 cm to 60 (splashing threshold 20 cm) and impacted hydrophilic surface. The images captured when half the were labeled according their outco...

The phenomenon of droplet impact is widely observed in nature and industrial processes. No matter the intrinsic wettability (hydrophobic, hydrophilic, superhydrophobic) surface, postimpact droplets tend to rebound or splash. dynamics have been well investigated but inhibition rebounding splashing requires further exploration. This paper proposes a periodic wetting surface (PWS) driven by triboe...

Greenwater (splashing of water on the deck) loading is a classical problem faced by designers ship-shaped vessels, which becomes even worse when vessel operates in harsh weather conditions for an extended period time. Installation breakwaters deck can play crucial role minimizing this impact. However, research design and optimization breakwater still its infancy, study aims at shedding further ...