Simulations of splashing high and low viscosity droplets

  title={Simulations of splashing high and low viscosity droplets},
  author={Arnout M. P. Boelens and Juan J. de Pablo},
  journal={Physics of Fluids},
In this work, simulations are presented for low viscosity ethanol and high viscosity silicone oil droplets impacting on a dry solid surface at atmospheric and reduced ambient pressure. The simulations are able to capture both the effect of the ambient gas pressure and liquid viscosity on the droplet impact and breakup. The results suggest that at early times droplet impact and gas film behavior for both low and high viscosity liquids share the same physics. However, at later times, during… 

Figures and Tables from this paper

Simulation of high-speed droplet impact against a dry/wet rigid wall for understanding the mechanism of liquid jet cleaning

Physical cleaning techniques are of great concern to remove particulate contamination because of their low environmental impact. One of the promising candidates is based on water jets that often

Splashing of fuel drops impacting on heated solid surfaces

Liquid drop impact on dry, solid surfaces has been studied to elucidate the role of control parameters, such as drop size, impact velocity, liquid properties, surface roughness, and wettability, on

Computing the viscous effect in early-time drop impact dynamics

Abstract The impact of a liquid drop on a solid surface involves many intertwined physical effects, and is influenced by drop velocity, surface tension, ambient pressure and liquid viscosity, among

On the splashing of high-speed drops impacting a dry surface

When a drop impacts a dry surface at high velocity, it atomises into secondary droplets. These small droplets are generated by one of two types of splashes: either by a prompt splash from the

Droplet Splashing on an Inclined Surface.

Oblique droplet impacts onto a smooth surface at various inclination angles and at different ambient gas pressures were investigated using high-speed photography. It was found that the droplet splash

Impact of emulsion drops on a solid surface: The effect of viscosity

This paper presents a study of the impact of various water in Jatropha biodiesel emulsion drops on a stainless steel surface. The composition of the emulsion is varied by changing the volume

Bouncing off the Walls: The Influence of Gas-Kinetic and van der Waals Effects in Drop Impact.

Simulation results agree with experiments, with the impact speed threshold between bouncing and wetting reproduced to within 5%, while a model without GKE overpredicts this value by at least 50%.



Comparison of splashing in high- and low-viscosity liquids.

It is found that there is also a delay in the ejection of a thin sheet when a low-viscosity drop splashes, and it is shown how the ejected time of the thin sheet depends on liquid viscosity and ambient gas pressure.

Observation of the pressure effect in simulations of droplets splashing on a dry surface

At atmospheric pressure, a drop of ethanol impacting on a solid surface produces a splash. Reducing the ambient pressure below its atmospheric value suppresses this splash. The origin of this

Thin film formation during splashing of viscous liquids.

After impact onto a smooth dry surface, a drop of viscous liquid initially spreads in the form of a thick lamella that emits a thin fluid sheet that can ultimately break up into droplets causing the splash.

Early post-impact time dynamics of viscous drops onto a solid dry surface

The spreading dynamics of liquid drops normally impacting a solid dry surface at high Reynolds and Weber numbers is experimentally and numerically studied at early post-impact times starting from

Kelvin–Helmholtz instability in an ultrathin air film causes drop splashing on smooth surfaces

The model agrees quantitatively with the experimental verifications and brings a fundamental understanding to the general phenomenon of drop splashing on smooth surfaces and effectively produces splashing.

Drop splashing is independent of substrate wetting

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,

Precursors to splashing of liquid droplets on a solid surface.

It is demonstrated that, neglecting intermolecular forces between the liquid and the solid, the liquid does not contact theSolid, and instead spreads on a very thin air film, which develops a high curvature and emits capillary waves.

Experiments of drops impacting a smooth solid surface: a model of the critical impact speed for drop splashing.

The derived equation, which expresses the splash threshold velocity as a function of the material properties of the two fluids involved, the drop radius, and the mean free path of the molecules composing the surrounding gaseous atmosphere is thoroughly validated experimentally at normal atmospheric conditions.

Liquid drop splashing on smooth, rough, and textured surfaces.

  • Lei Xu
  • Physics
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2007
Experimental studies of how the splash depends on the roughness and the texture of the surfaces as well as the viscosity of the liquid are reported.

The diameters and velocities of the droplets ejected after splashing

When a drop impacts a smooth, dry surface at a velocity above the so-called critical speed for drop splashing, the initial liquid volume loses its integrity, fragmenting into tiny droplets that are