Droplet impact on a wavy liquid film under multi-axis lateral vibrations

Khan, T.; Ersoy, Nuri Erdem; Eslamian, Morteza

doi:10.1007/s00348-020-03010-9

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…When a droplet impacts the liquid film, an impact cavity and a crown are initially formed, and these expand so that the residual liquid film at the bottom of the cavity gradually becomes thinner. [38][39][40][41][42][43][44] As the superhydrophobic surface is rough, when the residual liquid film becomes very thin, it is affected by the surface microstructure and ruptures. 45 Thereafter, a dry hole is formed inside the cavity.…”

Section: B Behavior Of Dry Holes Formed By Droplets Impacting On Liqu...mentioning

confidence: 99%

Impact-induced hole growth and liquid film dewetting on superhydrophobic surfaces

Chu

et al. 2021

Physics of Fluids

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Section: B Behavior Of Dry Holes Formed By Droplets Impacting On Liqu...mentioning

confidence: 99%

Impact-induced hole growth and liquid film dewetting on superhydrophobic surfaces

Chu

et al. 2021

Physics of Fluids

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“…Many researchers have investigated the dynamic behavior of droplet impact on liquid film in industrial applications, and most have concentrated on the crown. [13][14][15][16] They have focused not only on the dynamic behavior of the crown expansion but also on its morphology and splashing outcome by considering the influence of key parameters, such as the Weber number (We = ρ d v 2 imp d 0 /σ ), Reynolds number (Re = ρ d v imp d 0 /µ), Froude number (Fr = v 2 imp /gd 0 ), Ohnesorge number (Oh = µ/(ρ d d 0 σ ) 0.5 ), impact surface, and droplet and/or liquid film properties. [17][18][19]21,22] Here d 0 , ρ d , v imp , σ , g, and µ are respectively the droplet diameter, density, impact velocity, surface tension coefficient, acceleration of gravity, and dynamic viscosity.…”

Section: Introductionmentioning

confidence: 99%

Crown evolution kinematics of a camellia oil droplet impacting on a liquid layer

et al. 2022

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The phenomenon of droplet impact on the immiscible liquid is encountered in a variety of scenarios in nature and industrial production. Despite the exhaustive researches, it is not fully clear how the immiscibility of the droplet with impact liquid affects the crown evolution. The present work experimentally investigates the evolution kinematics of crown formed by a normal impact of camellia oil droplet on immiscible water layer. Based on discussion of dynamic impact behaviors for three critical Weber numbers (We), the radius of crown and its average spreading velocity are compared with those of previous theoretical models to discuss their applicability to the immiscible liquid. The evolution kinematics (morphology and velocity) are analyzed by considering the effects of We and layer thickness. Furthermore, the ability of crown expansion in radical and vertical directions is characterized by a velocity ratio. The results show that our experimental crown radius still follows a square-root function of evolution time, which agrees with the theoretical predictions. The dimensionless average spreading velocity decreases with We and follows a power-law, while the dimensionless average rising velocity remains constant. The velocity ratio is shown to be linearly increasing with We, demonstrating that the rising movement in crown evolution gradually enhances with We. These results are helpful for further investigation on the droplet impact on immiscible liquid layer.

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LIF-based quantification of the species transport during droplet impact onto thin liquid films

Ennayar,

Brockmann,

Hussong

2023

Exp Fluids

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In the present study, laser-induced fluorescence (LIF) is used to investigate the mixing process of a droplet impacting onto a thin liquid film. A robust multidimensional calibration procedure is developed enabling the extraction of local instantaneous dye concentrations as well as film heights. A series of validation measurements are conducted confirming a low reconstruction error of $$4.53\%$$ 4.53 % . The impact-induced mixing process is thoroughly investigated across various liquid film thicknesses to examine the propagation of the mixing zone and the instantaneous radial concentration gradients within it. It is shown that the maximum extent of the mixing zone scales inversely proportional with the thickness of the liquid film. Within our experiments, we discover the formation of wall-induced vortex ring instabilities subsequent to impact. The disintegration of vortex rings during droplet impact significantly enhances convection-driven mixing, as quantified by the coefficient of variation. Graphical abstract

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Droplet impact on a wavy liquid film under multi-axis lateral vibrations

Cited by 4 publications

References 51 publications

Impact-induced hole growth and liquid film dewetting on superhydrophobic surfaces

Impact-induced hole growth and liquid film dewetting on superhydrophobic surfaces

Crown evolution kinematics of a camellia oil droplet impacting on a liquid layer

LIF-based quantification of the species transport during droplet impact onto thin liquid films

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