From Bouncing to Floating: Noncoalescence of Drops on a Fluid Bath

Couder, Y.; Fort, Emmanuel; Gautier, Caroline; Boudaoud, Arezki

doi:10.1103/physrevlett.94.177801

Cited by 340 publications

(363 citation statements)

References 12 publications

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“…We expect the punctures to occur by van der Waals forces destabilizing the very thin films ( 200 nm, Couder et al 2005). The azimuthal spacing of the initial holes is ∼200 µm (estimated from second panel in figure 2b) which is in qualitative agreement with the wavelength λ which balances van der Waals and capillary pressures (Dorbolo et al 2005), i.e.…”

Section: Bubble Morphology: Hanging Necklaces and Bubble Chandelierssupporting

confidence: 68%

“…For low impact velocities, the air under the drop cushions the impact and prevents immediate contact. This layer can stretch into a submicron hemispheric film of air, which either causes rebounding of the drop (Couder et al 2005) or ruptures to form a myriad of entrapped micro-bubbles. The details of this rupture are unknown, principally due to the very rapid capillary-driven motions.…”

Section: Introductionmentioning

confidence: 99%

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Micro-bubble morphologies following drop impacts onto a pool surface

et al. 2012

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When a drop impacts at low velocity onto a pool surface, a hemispheric air layer cushions and can delay direct contact. Herein we use ultra-high-speed video to study the rupture of this layer, to explain the resulting variety of observed distribution of bubbles. The size and distribution of micro-bubbles is determined by the number and location of the primary punctures. Isolated holes lead to the formation of bubble necklaces when the edges of two growing holes meet, whereas bubble nets are produced by regular shedding of micro-bubbles from a sawtooth edge instability. For the most viscous liquids the air film contracts more rapidly than the capillary–viscous velocity through repeated spontaneous ruptures of the edge. From the speed of hole opening and the total volume of micro-bubbles we conclude that the air sheet ruptures when its thickness approaches ${\ensuremath{\sim} }100~\mathrm{nm} $.

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Section: Bubble Morphology: Hanging Necklaces and Bubble Chandelierssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Micro-bubble morphologies following drop impacts onto a pool surface

et al. 2012

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“…Configurations promoting non-contact have been explored, e.g. encapsulating the drop by a hydrophobic powder (Aussillous & Quere 2001) or oscillating the liquid surface to periodically renew the air film (Couder et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Levitation of a drop over a moving surface

et al. 2013

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We investigate the levitation of a drop gently deposited onto the inner wall of a rotating hollow cylinder. For a sufficient velocity of the wall, the drop steadily levitates over a thin air film and reaches a stable angular position in the cylinder, where the drag and lift balance the weight of the drop. Interferometric measurement yields the three-dimensional (3D) air film thickness under the drop and reveals the asymmetry of the profile along the direction of the wall motion. A two-dimensional (2D) model is presented which explains the levitation mechanism, captures the main characteristics of the air film shape and predicts two asymptotic regimes for the film thickness h 0 : For large drops h 0 ∼ Ca 2/3 κ −1 b , as in the Bretherton problem, where Ca is the capillary number based on the air viscosity and κ b is the curvature at the bottom of the drop. For small drops h 0 ∼ Ca 4/5 (aκ b ) 4/5 κ −1 b , where a is the capillary length.

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“…A simple and elegant method to achieve that purpose is to inject fresh air below the droplet by oscillating the interface. Couder et al [20] proposed to place a viscous oil droplet on a vibrated bath of the same oil. Depending on the size of the droplet, the reduced acceleration = Aω 2 /g must be larger than a threshold for bouncing the droplet forever.…”

Section: Bouncing Dropletmentioning

confidence: 99%

Antibubbles, liquid onions and bouncing droplets

Vandewalle

Terwagne

Gilet

et al. 2009

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tIn this paper, we emphasize our long series of experiments proving that the physical processes along fluid interfaces can be exploited for creating unusual fluidic objects. We report for the first time a couple of new fluidic objects so-called "liquid onions" and "mayonnaise" droplets. The study starts from the observation of antibubbles, exhibiting unstable liquid-air-liquid interfaces. We show that the lifetime of such a system has the same origin as floating/coalescing droplets on liquid surfaces. By analyzing such behaviours, we created droplets bouncing on a liquid bath. The methods and physical phenomena collected in this paper provide a basis for the development of a discrete microfluidics. Open questions are underlined, experimental challenges and future applications are proposed.

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From Bouncing to Floating: Noncoalescence of Drops on a Fluid Bath

Cited by 340 publications

References 12 publications

Micro-bubble morphologies following drop impacts onto a pool surface

Micro-bubble morphologies following drop impacts onto a pool surface

Levitation of a drop over a moving surface

Antibubbles, liquid onions and bouncing droplets

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