Drop splashing is independent of substrate wetting
Reads0
Chats0
TLDR
In this paper, the shape and motion of the air-liquid interface at the contact line/edge of the droplet are independent of wettability, and the authors use these findings to evaluate existing theories and to compare splashing with forced wetting.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/edge of the droplet are independent of wettability. We use these findings to evaluate existing theories and to compare splashing with forced wetting.read more
Citations
More filters
Journal ArticleDOI
Droplet impact: Viscosity and wettability effects on splashing.
H. Almohammadi,Alidad Amirfazli +1 more
TL;DR: To predict the splashing, a general empirical relationship is developed which explains all of the authors', and previously reported data, and the evolution of the lamella rim, dynamic contact angle, and velocity of the expanding lamella are explained.
Journal ArticleDOI
Role of the dynamic contact angle on splashing
Miguel A. Quetzeri-Santiago,Kensuke Yokoi,Alfonso A. Castrejón-Pita,J. Rafael Castrejón-Pita +3 more
TL;DR: In this paper, the splashing behavior of droplets upon impact onto a variety of substrates with different wetting properties, ranging from hydrophilic to super-hydrophobic surfaces, was studied.
Journal ArticleDOI
Effect of wettability on droplet impact: Spreading and splashing
TL;DR: Wang et al. as mentioned in this paper investigated the dynamic behaviors of water droplets over wide ranges of diameters and velocities, and put forward a prediction model of droplet splashing threshold, considering the effect of surface wettability.
Journal ArticleDOI
Phenomenology of droplet collision hydrodynamics on wetting and non-wetting spheres
TL;DR: In this paper, the spreading characteristics of water droplets impacted on a solid spherical target have been investigated experimentally and theoretically and the morphological outcome of this impingement process has been quantitatively discussed with three geometric parameters, namely, liquid film thickness at the north-pole of the target surface, spread factor, and the maximum spread angle.
Journal ArticleDOI
Lifting a sessile oil drop from a superamphiphobic surface with an impacting one
Olinka Ramírez-Soto,Olinka Ramírez-Soto,Vatsal Sanjay,Detlef Lohse,Detlef Lohse,Jonathan T. Pham,Doris Vollmer +6 more
TL;DR: The dynamics of an oil drop impacting an identical sessile drop sitting on a superamphiphobic surface is investigated and varying the offset from head-on alignment and the impact velocity results in controllable rebound dynamics for oil drop collisions on superamphipshobic surfaces.
References
More filters
Journal ArticleDOI
Drop Impact on a Solid Surface
TL;DR: In this article, the authors focus on recent experimental and theoretical studies, which aim at unraveling the underlying physics, characterized by the delicate interplay of liquid inertia, viscosity, and surface tension, but also the surrounding gas.
Dissertation
Computational fluid dynamics of dispersed two-phase flows at high phase fractions
TL;DR: In this paper, the authors describe the development and validation of Computational Fluid Dynamics (CFD) methodology for the simulation of dispersed two-phase flows, which employs averaged mass and momentum conservation equations to describe the time-dependent motion of both phases.
Journal ArticleDOI
A study of the advancing interface. I. Interface shape in liquid—gas systems
TL;DR: In this article, the shape of the advancing liquid-air interface has been studied in a glass capillary over the range in which viscous and interfacial forces are the dominant factors controlling the system.
Journal ArticleDOI
Contact-line dynamics of a diffuse fluid interface
TL;DR: In this article, an analysis of the moving contact line dynamics of a Cahn-Hilliard-van der Waals (CHW) diffuse mean-field interface is presented.
Journal ArticleDOI
Drop splashing on a dry smooth surface.
TL;DR: Experimental scaling relations support a model in which compressible effects in the gas are responsible for splashing in liquid solid impacts.