Inverted Leidenfrost-like Effect during Condensation

Narhe, R. D.; Anand, Sam; Rykaczewski, Konrad; Medici, Marie Gabrielle; González-Viñas, Wenceslao; Beysens, Daniel

doi:10.1021/la504850x

Cited by 11 publications

(16 citation statements)

References 44 publications

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“…This topic is investigated more deeply by Vakarelski et al, 5,6 who observed the stabilization of a vapor layer surrounding a hot sphere, with a superhydrophobic surface, in cold water and found that this effect leads to drag reduction. Narhe et al 7 studied an inverted Leidenfrost-like effect which occurs during condensation of solvent droplets and concluded that motion of these droplets can be induced by a thermocapillary Marangoni effect. Due to the poor thermal conductivity of the vapor layer, a Leidenfrost droplet (LD) absorbs less heat than a droplet in direct contact with a high-temperature substrate and consequently exhibits a longer lifetime.…”

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confidence: 99%

Behavior of self-propelled acetone droplets in a Leidenfrost state on liquid substrates

2017

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It is demonstrated that non-coalescent droplets of acetone can be formed on liquid substrates. The fluid flows around and in an acetone droplet hovering on water are recorded to shed light on the mechanisms which might lead to non-coalescence. For sufficiently low impact velocities, droplets undergo a damped oscillation on the surface of the liquid substrate but at higher velocities clean bounce-off occurs. Comparisons of experimentally observed static configurations of floating droplets to predictions from a theoretical model for a small non-wetting rigid sphere resting on a liquid substrate are made and a tentative strategy for determining the thickness of the vapor layer under a small droplet on a liquid is proposed. This strategy is based on the notion of effective surface tension. The droplets show self-propulsion in straight line trajectories in a manner which can be ascribed to a Marangoni effect. Surprisingly, self-propelled droplets can become immersed beneath the undisturbed water surface. This phenomenon is reasoned to be drag-inducing and might provide a basis for refining observations in previous work.

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confidence: 99%

Behavior of self-propelled acetone droplets in a Leidenfrost state on liquid substrates

2017

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“…26,27 More recently, an inverted Leidenfrost effect was demonstrated during condensation of water drops on frozen liquid layers. 28 Although fascinating, several factors limit applications for the classical Leidenfrost levitation mechanism, such as drop evaporation, drop temperature control, and dependence on liquid properties, e.g. boiling temperature.…”

Section: Introductionmentioning

confidence: 99%

“…26,27 More recently, an inverted Leidenfrost effect has been demonstrated during the condensation of water drops on frozen liquid layers. 28 Although fascinating, several factors limit the applications of the classical Leidenfrost levitation mechanism, such as drop evaporation, drop temperature control, and dependence on liquid properties, for example, boiling temperature. Because of the aforementioned limitations, the integration of this physical concept into lab-on-a-chip and microfluidic devices where liquids have to be processed with extreme precision is not recommended, and alternative contactless approaches have to be followed.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In 1756, J. G. Leidenfrost discovered that a water drop can float on a hot substrate, above 300 °C, owing to rapid drop evaporation at the interface. The principle was also extended to allow the self-propulsion of a sublimating body on a metal ratchet. , More recently, an inverted Leidenfrost effect has been demonstrated during the condensation of water drops on frozen liquid layers . Although fascinating, several factors limit the applications of the classical Leidenfrost levitation mechanism, such as drop evaporation, drop temperature control, and dependence on liquid properties, for example, boiling temperature.…”

Section: Introductionmentioning

confidence: 99%

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Contactless Transport and Mixing of Liquids on Self-Sustained Sublimating Coatings

et al. 2017

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Controlled handling of liquids and colloidal suspensions as they interact with surfaces, targeting a broad palette of related functionalities, is of great importance in science, technology, and nature. When small liquid volumes (drops on the order of microliters or nanoliters) need to be processed in microfluidic devices, contamination on the solid/liquid interface and loss of liquid due to adhesion on the transport channels are two very common problems that can significantly alter the process outcome, for example, the chemical reaction efficiency or the purity and the final concentration of a suspension. It is, therefore, no surprise that both levitation and minimal contact transport methods-including nonwetting surfaces-have been developed to minimize the interactions between liquids and surfaces. Here, we demonstrate contactless surface levitation and transport of liquid drops, realized by harnessing and sustaining the natural sublimation of a solid-carbon-dioxide-coated substrate to generate a continuous supporting vapor layer. The capability and limitations of this technique in handling liquids of extreme surface tension and kinematic viscosity values are investigated both experimentally and theoretically. The sublimating coating is capable of repelling many viscous and low-surface-tension liquids, colloidal suspensions, and non-Newtonian fluids as well, displaying outstanding omniphobic properties. Finally, we demonstrate how sublimation can be used for liquid transport, mixing, and drop coalescence, with a sublimating layer coated on an underlying substrate with prefabricated channels, conferring omniphobicity using a simple physical approach (i.e., phase change) rather than a chemical one. The independence of the surface levitation principle from material properties, such as electromagnetic, thermal or optical, surface energy, adhesion, or mechanical properties, renders this method attractive for a wide range of potential applications.

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“…The energy can be also provided by the condensed phase (the droplet or the dry ice piece); this is the so-called inverse Leidenfrost effect. [6][7][8][9] The general principle is to trigger the rapid phase change of the liquid or of the solid to the vapour phase to create a lubrication film of vapour between the liquid or the solid and the substrate. In other words, the rapid generation of a light phase film due to a phase transition provoked by the proximity to an energy source isolates the material that changes of phase from the rest of the experiment.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous rotation of an ice disk while melting on a solid plate

2016

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Ice disks were released at the surface of a thermalised aluminium plate. The fusion of the ice creates a lubrication film between the ice disk and the plate. The situation is similar to the Leidenfrost effect reported for a liquid droplet evaporating at the surface of a plate which temperature is above the boiling temperature of the liquid. An analogy is depicted between the Leidenfrost phenomenon and the rapid fusion of a solid at the contact of a hot plate. Similarly to Leidenfrost droplet, we observe that, while the ice disks were melting, the disks were very mobile: translation and rotation. A hole was drilled in the plate and allowed the canalising of the melted liquid. Under these conditions, we discover that the rotation of the ice disk is systematic and persistent. Moreover, the rotation speed increases with the temperature of the plate and with the load put on the ice disk. A model is proposed to explain the spontaneous rotation of the ice disk. We claim that the rotation is due to the viscous drag of the liquid that flows around the ice disk. Published by AIP Publishing.

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Inverted Leidenfrost-like Effect during Condensation

Cited by 11 publications

References 44 publications

Behavior of self-propelled acetone droplets in a Leidenfrost state on liquid substrates

Behavior of self-propelled acetone droplets in a Leidenfrost state on liquid substrates

Contactless Transport and Mixing of Liquids on Self-Sustained Sublimating Coatings

Spontaneous rotation of an ice disk while melting on a solid plate

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