Trapping Leidenfrost Drops with Crenelations

Dupeux, Guillaume; Merrer, Marie Le; Clanet, Christophe; Quéré, David

doi:10.1103/physrevlett.107.114503

Cited by 58 publications

(56 citation statements)

References 12 publications

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“…Although discovered in 1756 and widely studied in connection with heat transfer technologies, this so-called Leidenfrost effect is the subject of a renewed interest nowadays [2], particularly in view of new perspectives in the field of microfluidics. Indeed, as the relatively small thermal conductivity of the vapor layer slows down the phase change process, while its low viscosity confers an extreme mobility to the drop, the control and manipulation of Leidenfrost drops turns out to be possible using ratchets or other surface structures [3][4][5][6], magnetic fields [7], or electric fields [8].…”

Section: Introductionmentioning

confidence: 99%

Leidenfrost effect: Accurate drop shape modeling and refined scaling laws

et al. 2014

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We here present a simple fitting-parameter-free theory of the Leidenfrost effect (droplet levitation above a superheated plate) covering the full range of stable shapes, i.e., from small quasispherical droplets to larger puddles floating on a pocketlike vapor film. The geometry of this film is found to be in excellent quantitative agreement with the interferometric measurements of Burton et al. [Phys. Rev. Lett. 109, 074301 (2012)]. We also obtain new scalings generalizing classical ones derived by Biance et al. [Phys. Fluids 15, 1632(2003] as far as the effect of plate superheat is concerned and highlight the relative role of evaporation, gravity, and capillarity in the vapor film. To further substantiate these findings, a treatment of the problem by matched asymptotic expansions is also presented.

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Section: Introductionmentioning

confidence: 99%

Leidenfrost effect: Accurate drop shape modeling and refined scaling laws

et al. 2014

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“…But the texture can also be much larger, comparable to the liquid scale (0.1-1 mm). When a levitating drop meets a series of crenelations placed in its way, it decelerates on centimeter-size distances instead of meters (Figure 6 and Supplemental Video 5) (Dupeux et al 2011a). This strong effect has been proposed to result from the successive impacts of the liquid on the crenel sides (Dupeux et al 2011a).…”

Section: Frictionmentioning

confidence: 98%

“…These drops move nearly without friction (Dupeux et al 2011a), and they bounce when impacting solids (Biance et al 2006, Karl & Frohn 2000, Wachters & Westerling 1966. This section discusses some of these special dynamics.…”

Section: Special Dynamicsmentioning

confidence: 99%

Leidenfrost Dynamics

Quéré

2013

Annu. Rev. Fluid Mech.

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476

323

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This review discusses how drops can levitate on a cushion of vapor when brought in contact with a hot solid. This is the so-called Leidenfrost phenomenon, a dynamical and transient effect, as vapor is injected below the liquid and pressed by the drop weight. The absence of solid/liquid contact provides unique mobility for the levitating liquid, contrasting with the usual situations in which contact lines induce adhesion and enhanced friction: hence a frictionless motion, and the possibility of bouncing after impact. All these characteristics can be combined to create devices in which selfpropulsion is obtained, using asymmetric textures on the hot solid surface.

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“…(7) and (13). For real simple fluids on the surface of the Earth, the capillary length R c is a macroscopic length scale (R c ).…”

Section: B Simulation Detailsmentioning

confidence: 99%

“…These include quenching of metals, quick-response steam generators, spray drying, spray cooling of nuclear reactor cores, and film cooling of rocket nozzles. Recently, the rich behaviors of the Leidenfrost droplets have become better understood with the help of high speed and ultra-high-speed video imaging, surface coating, and micromachining [3,[5][6][7][9][10][11][12][13][14][15][16][17]. Below are a few key aspects of the Leidenfrost phenomena.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of Leidenfrost droplets in one-component fluids

Qian

2013

Phys. Rev. E

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Using the dynamic van der Waals theory [Phys. Rev. E 75, 036304 (2007)], we numerically investigate the hydrodynamics of Leidenfrost droplets under gravity in two dimensions. Some recent theoretical predictions and experimental observations are confirmed in our simulations. A Leidenfrost droplet larger than a critical size is shown to be unstable and break up into smaller droplets due to the Rayleigh-Taylor instability of the bottom surface of the droplet. Our simulations demonstrate that an evaporating Leidenfrost droplet changes continuously from a puddle to a circular droplet, with the droplet shape controlled by its size in comparison with a few characteristic length scales. The geometry of the vapor layer under the droplet is found to mainly depend on the droplet size and is nearly independent of the substrate temperature, as reported in a recent experimental study [Phys. Rev. Lett. 109, 074301 (2012)]. Finally, our simulations demonstrate that a Leidenfrost droplet smaller than a characteristic size takes off from the hot substrate because the levitating force due to evaporation can no longer be balanced by the weight of the droplet, as observed in a recent experimental study [Phys. Rev. Lett. 109, 034501 (2012)].

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Trapping Leidenfrost Drops with Crenelations

Cited by 58 publications

References 12 publications

Leidenfrost effect: Accurate drop shape modeling and refined scaling laws

Leidenfrost effect: Accurate drop shape modeling and refined scaling laws

Leidenfrost Dynamics

Hydrodynamics of Leidenfrost droplets in one-component fluids

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