Drop Impact on a Solid Surface

Josserand, Christophe; Thoroddsen, Sigurður T.

doi:10.1146/annurev-fluid-122414-034401

Cited by 1,225 publications

(824 citation statements)

References 158 publications

(181 reference statements)

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“…This dynamics is similar to that following a mechanical impact such as on a solid substrate or a pillar, which has been studied thoroughly (see e.g. Clanet et al 2004;Yarin 2006;Villermaux & Bossa 2011;Kolinski et al 2012;Riboux & Gordillo 2014;Josserand & Thoroddsen 2016), including a few studies on the fragmentation of the drop (Villermaux 2007;Xu et al 2007;Villermaux & Bossa 2009, 2011Riboux & Gordillo 2014). A laser proves to be an adequate tool to vary the extension of the impact without arXiv:1512.02415v1 [physics.flu-dyn] 8 Dec 2015…”

Section: Introductionmentioning

confidence: 94%

Drop deformation by laser-pulse impact

et al. 2016

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A free-falling absorbing liquid drop hit by a nanosecond laser-pulse experiences a strong recoil-pressure kick. As a consequence, the drop propels forward and deforms into a thin sheet which eventually fragments. We study how the drop deformation depends on the pulse shape and drop properties. We first derive the velocity field inside the drop on the timescale of the pressure pulse, when the drop is still spherical. This yields the kinetic-energy partition inside the drop, which precisely measures the deformation rate with respect to the propulsion rate, before surface tension comes into play. On the timescale where surface tension is important the drop has evolved into a thin sheet. Its expansion dynamics is described with a slender-slope model, which uses the impulsive energy-partition as an initial condition. Completed with boundary integral simulations, this two-stage model explains the entire drop dynamics and its dependance on the pulse shape: for a given propulsion, a tightly focused pulse results in a thin curved sheet which maximizes the lateral expansion, while a uniform illumination yields a smaller expansion but a flat symmetric sheet, in good agreement with experimental observations. IntroductionA laser pulse interacting with an absorbing liquid body can deposit a finite amount of energy, concentrated both in time and space, which eventually triggers a dramatic hydrodynamic response. Focused nanosecond pulses have for instance been used to induce cavitation in liquids confined in capillary tubes (Vogel et al. 1996;Sun et al. 2009;Tagawa et al. 2012), or jetting and spraying in sessile drops (Thoroddsen et al. 2009). These situations involving a liquid close to a wall result in localized flows. By contrast, we consider here the situation of a mobile liquid body: the impact of a nanosecond laser pulse onto an absorbing unconfined liquid drop, which, as first described by Klein et al. (2015), has a global hydrodynamic response to the pulse: the drop propels forward at a speed of several meters per second, strongly deforms and eventually fragments (see Fig. 1). This dynamics is similar to that following a mechanical impact such as on a solid substrate or a pillar, which has been studied thoroughly (see e.g. Clanet et al. 2004;Yarin 2006;Villermaux & Bossa 2011;Kolinski et al. 2012;Riboux & Gordillo 2014;Josserand & Thoroddsen 2016), including a few studies on the fragmentation of the drop (Villermaux 2007;Xu et al. 2007;Villermaux & Bossa 2009, 2011Riboux & Gordillo 2014). A laser proves to be an adequate tool to vary the extension of the impact without arXiv:1512.02415v1 [physics.flu-dyn] 8 Dec 2015

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Section: Introductionmentioning

confidence: 94%

Drop deformation by laser-pulse impact

et al. 2016

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“…In particular, in a multiphase flow context the dynamics of bubbles and droplets including their deformation, coalescence and breakup are intriguing processes which have gained a lot of attention in the scientific community, cf. [4,6,21,23,24]. In two-phase flows, being the most common multiphase flow configuration involving two distinct fluids, the fluids are segregated by a very thin interfacial region where surface tension effects and mass transfer due to chemical reactions may appear.…”

Section: Introductionmentioning

confidence: 99%

Isogeometric Analysis of the Navier–Stokes–Cahn–Hilliard equations with application to incompressible two-phase flows

Hosseini

Turek

Möller

et al. 2017

Journal of Computational Physics

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In this work, we present our numerical results of the application of Galerkin-based Isogeometric Analysis (IGA) to incompressible Navier-Stokes-Cahn-Hilliard (NSCH) equations in velocity-pressurephase field-chemical potential formulation. For the approximation of the velocity and pressure fields, LBB compatible non-uniform rational B-spline spaces are used which can be regarded as smooth generalizations of Taylor-Hood pairs of finite element spaces. The one-step θ-scheme is used for the discretization in time. The static and rising bubble, in addition to the nonlinear Rayleigh-Taylor instability flow problems, are considered in two dimensions as model problems in order to investigate the numerical properties of the scheme.

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“…Droplet impact is involved in a large number of industrial applications and natural phenomena from ink-jet printing to fuel atomization, surface treatment or soil erosion (Rein 1993;Yarin 2006;Josserand & Thoroddsen 2016). Understanding the physics of impacts, as well as predicting and/or controlling their outcome thus remains a major challenge in fluid mechanics.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, if the various relevant effects involving the gas have been identified, namely compressibility, inertia, contact-line dynamics and non-continuum effects, their quantitative contributions still remain to be investigated and the interplay between the lamella formation and the wetting of the substrate needs also to be clarified (Riboux & Gordillo 2014;Josserand & Thoroddsen 2016).…”

Section: Introductionmentioning

confidence: 99%

Two mechanisms of droplet splashing on a solid substrate

et al. 2017

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We investigate droplet impact on a solid substrate in order to understand the influence of the gas in the splashing dynamics. We use numerical simulations where both the liquid and the gas phases are considered incompressible in order to focus on the gas inertial and viscous contributions. We first confirm that the dominant gas effect on the dynamics is due to its viscosity through the cushioning of the gas layer beneath the droplet. We then exhibit an additional inertial effect that is directly related to the gas density. The two different splashing mechanisms initially suggested theoretically are observed numerically, depending on whether a jet is created before or after the impacting droplet wets the substrate. Finally, we provide a phase diagram of the drop impact outputs as the gas viscosity and density vary, emphasizing the dominant effect of the gas viscosity with a small correction due to the gas density. Our results also suggest that gas inertia influences the splashing formation through a Kelvin-Helmoltz like instability of the surface of the impacting droplet, in agreement with former theoretical works.

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Drop Impact on a Solid Surface

Cited by 1,225 publications

References 158 publications

Drop deformation by laser-pulse impact

Drop deformation by laser-pulse impact

Isogeometric Analysis of the Navier–Stokes–Cahn–Hilliard equations with application to incompressible two-phase flows

Two mechanisms of droplet splashing on a solid substrate

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