Self-Propelled Leidenfrost Droplets

Linke, Heiner; Alemán, Benjamín; Melling, Laura; Taormina, Michael J.; Francis, M. J.; Dow-Hygelund, Corey; Narayanan, Vinod; Taylor, R. P.; Stout, A.

doi:10.1103/physrevlett.96.154502

Cited by 494 publications

(440 citation statements)

References 19 publications

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“…As a ubiquitous phenomenon in nature, droplet motion on solid substrates has attracted great attention for decades because of the fundamental physics involved [1][2][3][4][5][6][7][8][9][10] and its relevance to a wide range of applications in chemistry, biology, and industry [11][12][13][14][15]. Though there has been extensive work on the subject, many aspects of this seemingly simple phenomenon remain issues of interest to fundamental research.…”

Section: Introductionmentioning

confidence: 99%

Thermal singularity and droplet motion in one-component fluids on solid substrates with thermal gradients

Qian

2012

Phys. Rev. E

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Using a continuum model capable of describing the one-component liquid-gas hydrodynamics down to the contact line scale, we carry out numerical simulation and physical analysis for the droplet motion driven by thermal singularity. For liquid droplets in one-component fluids on heated or cooled substrates, the liquid-gas interface is nearly isothermal. Consequently, a thermal singularity occurs at the contact line and the Marangoni effect due to temperature gradient is suppressed. Through evaporation or condensation in the vicinity of the contact line, the thermal singularity makes the contact angle increase with the increasing substrate temperature. This effect on the contact angle can be used to move the droplets on substrates with thermal gradients. Our numerical results for this kind of droplet motion are explained by a simple fluid dynamical model at the droplet length scale. Since the mechanism for droplet motion is based on the change of contact angle, a separation of length scales is exhibited through a comparison between the droplet motion induced by a wettability gradient and that by a thermal gradient. It is shown that the flow field at the droplet length scale is independent of the statics or dynamics at the contact line scale.

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Section: Introductionmentioning

confidence: 99%

Thermal singularity and droplet motion in one-component fluids on solid substrates with thermal gradients

Qian

2012

Phys. Rev. E

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“…Droplet manipulation can be obtained using passive techniques such as wettability gradients or "designed" surface textures, 1−4 as well as using active techniques where droplets may respond to external stimuli such as vibrations, 5−7 light, 8,9 electric fields, 10 acoustics, 11 magnetic fields, 12,13 or cyclical mechanical deformation of the substrate. 14 In addition to the abovementioned methods, droplet manipulation in many heat transfer applications can also be obtained passively using in situ phase change processes as exemplified by the Leidenfrost effect 15,16 (Figure 1a), self-propelled motion during evaporation, 17,18 and water droplet motion during condensation on phase change materials (PCMs). 19,20 The latter phenomenon, first reported by Steyer et al, 19 was observed during condensation of water on solid cyclohexane kept at a temperature T c below its melting temperature (T m = 6.52°C…”

Section: Introductionmentioning

confidence: 99%

Inverted Leidenfrost-like Effect during Condensation

et al. 2015

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Water droplets condensing on solidified phase change materials such as benzene and cyclohexane near their melting point show in-plane jumping and continuous "crawling" motion. The jumping drop motion has been tentatively explained as an outcome of melting and refreezing of the materials surface beneath the droplets and can be thus considered as an inverted Leidenfrost-like effect (in the classical case vapor is generated from a droplet on a hot substrate). We present here a detailed investigation of jumping movements using high-speed imaging and static crosssectional cryogenic focused ion beam scanning electron microscope imaging. Our results show that drop motion is induced by a thermocapillary (Marangoni) effect. The in-plane jumping motion can be delineated to occur in two stages. The first stage occurs on a millisecond time scale and comprises melting the substrate due to drop condensation. This results in droplet depinning, partial spreading, and thermocapillary movement until freezing of the cyclohexane film. The second stage occurs on a second time scale and comprises relaxation motion of the drop contact line (change in drop contact radius and contact angle) after substrate freezing. When the cyclohexane film cannot freeze, the droplet continuously glides on the surface, resulting in the crawling motion.

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“…A general description of unbiased transport of particles in nature, which is named ratchet effect, is a challenging issue with implications in distinct areas, such as in molecular motors in biology [1], nanosystems like graphene [2], control of cancer metastasis [3], micro and nanofluids [4], particles in silicon membrane pores [5], cold atoms [6], solids and drops transport using the Leidenfrost effect [7,8], quantum systems [9][10][11][12], among many others. Certainly the most relevant and common goal in describing these ratchet systems is to unveil how to control and attain an efficient transport by choosing the appropriate physical parameter combination, like temperature, dissipation, external forces etc.…”

Section: Introductionmentioning

confidence: 99%

Quantum-classical transition and quantum activation of ratchet currents in the parameter space

et al. 2015

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The quantum ratchet current is studied in the parameter space of the dissipative kicked rotor model coupled to a zero temperature quantum environment. We show that vacuum fluctuations blur the generic isoperiodic stable structures found in the classical case. Such structures tend to survive when a measure of statistical dependence between the quantum and classical currents are displayed in the parameter space. In addition, we show that quantum fluctuations can be used to overcome transport barriers in the phase space. Related quantum ratchet current activation regions are spotted in the parameter space. Results are discussed based on quantum, semiclassical and classical calculations. While the semiclassical dynamics involves vacuum fluctuations, the classical map is driven by thermal noise.

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Self-Propelled Leidenfrost Droplets

Cited by 494 publications

References 19 publications

Thermal singularity and droplet motion in one-component fluids on solid substrates with thermal gradients

Thermal singularity and droplet motion in one-component fluids on solid substrates with thermal gradients

Inverted Leidenfrost-like Effect during Condensation

Quantum-classical transition and quantum activation of ratchet currents in the parameter space

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