Dynamics and flow characterization of liquid fountains produced by light scattering

Chesneau, Hugo; Petit, J.; Chraïbi, Hamza; Delville, Jean‐Pierre

doi:10.1103/physrevfluids.5.024002

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…Inside the water drops, this flow induces convection cells that are made visible by the swirling plumes of small IL-rich droplets produced by the double phase-separation (see inset of Figure 5 at t = 15 s) [53,54]. We believe that the very low interfacial tension inherent to near-critical binary mixtures is a key to the formation of such pattern [55][56][57].…”

Section: Description Of the Phase Separation Patternmentioning

confidence: 94%

Thermocapillary instability of an ionic liquid-water mixture in a temperature gradient

2021

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Ionic liquids have remarkable properties and are commonly harnessed for green chemistry, lubrication and energy applications. In this paper, we study a thermo-responsive Ionic Liquid (IL) solution which has the property of phase separating above a critical temperature, an interesting feature for the recovery of the IL-rich phase. For this purpose, we generate a temperature gradient in a microfluidic cavity where the confinement strengthens wetting effects and enhances the demixing. In this experimental configuration, we report the separation patterns along the phase diagram of the binary mixture composition. Three separation dynamics regime are identified that may display complex three-dimensional flows. In spite of this complexity, we rationalize all the observed regimes. Only two regimes lead to a complete spatial separation of the two phases. Interestingly, one is reminiscent of a Marangoni instability in radial geometry, even at confinement below 100 µm. We believe this work will find applications in the recycling of ionic liquids.

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Section: Description Of the Phase Separation Patternmentioning

confidence: 94%

Thermocapillary instability of an ionic liquid-water mixture in a temperature gradient

2021

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“…Since then, several other mechanical effects of acoustic and electromagnetic waves on liquids and liquid interfaces have been identified, in particular in presence of wave absorption or wave scattering by liquids. Namely, one can mention situations where interface deformations result from either bulk flows triggered by bulk forces [8,[18][19][20] or thermocapillary flows originating from interfacial tension gradients triggered by temperature gradients [21,22]. Regarding non-scattering and non-absorbing liquids, the previously cited studies have led to conclude that the observed morphological diversity of fluid interface deformations originates basically from the mutual interplay between the shape of the interface deformed by the radiation pressure and the wave propagation.…”

Section: Introductionmentioning

confidence: 99%

“…However, since the near-critical micro-emulsions involved in the first experimental observations were turbid [7], both both radiation pressure and bulk radiation forces may contribute to the slenderness transition. Since then, bulk radiation forces associated with turbidity have been shown to induce a jet transition (i.e., the sudden occurrence of droplet emission at the tip of a needle-like deformation [8]) which shares several common features with the slenderness transition [19,36]. The question of whether the slenderness transition can be triggered solely by radiation pressure is still open.…”

Section: Introductionmentioning

confidence: 99%

Ab initio simulation of universal morphogenesis of fluid interface deformations driven by radiation pressure

Chesneau¹,

Chraïbi²,

Bertin³

et al. 2022

Preprint

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We report on ab initio simulation of fluid interface deformations induced either by acoustic or optical radiation pressure. This is done by solving simultaneously the scalar wave propagation equation and the two-phase flow equations using the boundary element method. Using dimensional analysis, we show that interface deformation morphogenesis is universal, i.e. depends on the same dimensionless parameters in acoustics and electromagnetics. We numerically investigate a few selected phenomena-in particular the shape of large deformations, the slenderness transition and its hysteresis-and compare with existing and novel experimental observations. Qualitative agreement between the numerical simulations and experiments is found when the mutual interaction between wave propagation and wave-induced deformations is taken into account. Our results demonstrate the leading role of the radiation pressure in morphogenesis of fluid interface deformations and the importance of the propagation-deformation interplay .

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“…However, this kind of method cannot be reversibly regulated. Active methods are mainly driven by light, heat, magnetic field, and electric field, among which magnetic field and electric field are the most widely studied. − These two methods have been successfully applied in the fields of microfluidics, biomedicine, and so on. − However, they have special requirements for materials, and there are still some shortcomings; for example, the magnetic control method requires the fluid to be magnetic, and electrowetting has large hysteresis. , …”

Section: Introductionmentioning

confidence: 99%

Controllable Flowing of a Dielectric Fluid Droplet under the Action of Corona Discharge

Zhou

Pan²,

Guo

et al. 2021

Langmuir

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Polymer microfluidic technology is widely used in chemistry, biology, medicine, nanoparticles synthesis, and other fields. In this article, we introduce a novel method for the controllable flowing of dielectric fluid droplets. Under the action of corona discharge, the dielectric fluid droplet can be controllably driven to one or more conductive plate electrodes that are connected to the negative electrode on the substrate. Phenomena of polymerization, migration, and separation and merger are experimentally verified in detail, and the spreading speeds and steady-state time are discussed. The experimental results show that the proposed method is accurate and controllable.

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Dynamics and flow characterization of liquid fountains produced by light scattering

Cited by 4 publications

References 33 publications

Thermocapillary instability of an ionic liquid-water mixture in a temperature gradient

Thermocapillary instability of an ionic liquid-water mixture in a temperature gradient

Ab initio simulation of universal morphogenesis of fluid interface deformations driven by radiation pressure

Controllable Flowing of a Dielectric Fluid Droplet under the Action of Corona Discharge

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