Stabilization of Leidenfrost vapour layer by textured superhydrophobic surfaces

  title={Stabilization of Leidenfrost vapour layer by textured superhydrophobic surfaces},
  author={Ivan U. Vakarelski and Neelesh A. Patankar and Jeremy O. Marston and Derek Y. C. Chan and Sigurdur T. Thoroddsen},
In 1756, Leidenfrost observed that water drops skittered on a sufficiently hot skillet, owing to levitation by an evaporative vapour film. Such films are stable only when the hot surface is above a critical temperature, and are a central phenomenon in boiling. In this so-called Leidenfrost regime, the low thermal conductivity of the vapour layer inhibits heat transfer between the hot surface and the liquid. When the temperature of the cooling surface drops below the critical temperature, the… 

The cold Leidenfrost regime

It is discussed here how heat enhances superhydrophobicity by favoring a “cold Leidenfrost regime” where water adhesion becomes nonmeasurable even at moderate substrate temperature.

Leidenfrost vapour layer moderation of the drag crisis and trajectories of superhydrophobic and hydrophilic spheres falling in water.

It is found that a stable vapour layer sustained on the textured superhydrophobic surface of spheres falling through 95 °C water can reduce the hydrodynamic drag by up to 75% and stabilize the sphere trajectory for the Reynolds number between 10(4) and 10(6), spanning the drag crisis in the absence of the vapours.

The thermo-wetting instability driving Leidenfrost film collapse

This work investigates the vapor film instability for small length scales that ultimately sets the collapse condition at the Leidenfrost point of a fluid, and proposes an ab initio, mathematical expression for theLeidenf Frost point of the LFP.

The nanoscale instability driving Leidenfrost film collapse

Above a critical temperature known as the Leidenfrost point (LFP), a heated surface can suspend a liquid droplet above a film of its own vapor. The insulating vapor film can be highly detrimental in

The Leidenfrost temperature increase for impacting droplets on carbon-nanofiber surfaces.

It is experimentally shown that surfaces covered with carbon-nanofibers delay the transition to film boiling to much higher temperatures compared to smooth surfaces, which is consistent with the The authors(3/10) scaling as predicted for large They by a scaling analysis.

Non-wetting droplets on hot superhydrophilic surfaces.

This work reports an unexpected behaviour where non-wetting droplets are formed by slightly heating superhydrophilic microstructured surfaces beyond the saturation temperature (>5 °C), and offers an expanded parametric space for fabricating surfaces with desired temperature-dependent wettability.

Leidenfrost drops cooling surfaces: theory and interferometric measurement

When a liquid drop is placed on a highly superheated surface, it can be levitated by its own vapour. This remarkable phenomenon is referred to as the Leidenfrost effect. The thermally insulating

Leidenfrost drops on micro/nanostructured surfaces

In the Leidenfrost state, the liquid drop is levitated above a hot solid surface by a vapor layer generated via evaporation from the drop. The vapor layer thermally insulates the drop from the



Supernucleating surfaces for nucleate boiling and dropwise condensation heat transfer

Roughness-based superhydrophobic surfaces have been extensively studied over the past decade. The primary objective in most of those studies has been to mimic nature, e.g. lotus leaves, to produce

Water droplet motion control on superhydrophobic surfaces: exploiting the Wenzel-to-Cassie transition.

It is demonstrated that water droplets can transit from the Wenzel-to-Cassie state even though the former is energetically favored, and it is found that two distinct superhydrophobic states are produced.

Underwater restoration and retention of gases on superhydrophobic surfaces for drag reduction.

This Letter finds surface structures that allow the restoration of a gas blanket from a wetted state while fully immersed underwater and designs a self-controlled gas-generation mechanism that maintains the SHPo condition under high liquid pressures as well as in the presence of surface defects, thus removing a fundamental barrier against the implementation of SHPo surfaces for drag reduction.

Immersed superhydrophobic surfaces: Gas exchange, slip and drag reduction properties

Superhydrophobic surfaces combine high aspect ratio micro- or nano-topography and hydrophobic surface chemistry to create super water-repellent surfaces. Most studies consider their effect on


Pool boiling from a super-water-repellent(SWR) surface has been studied. The SWR surface has a coating layer of fine particles of nickel and PTFE. Its contact angle to water is 152° in room

On the effect of surface roughness height, wettability, and nanoporosity on Leidenfrost phenomena

In recent quenching heat transfer studies of nanofluids, it was found that deposition of nanoparticles on a surface raises its Leidenfrost point (LFP) considerably [Kim et al., Int. J. Multiphase

Comment on Water droplet motion control on superhydrophobic surfaces: exploiting the Wenzel-to-Cassie transition.

  • E. Bormashenko
  • Physics
    Langmuir : the ACS journal of surfaces and colloids
  • 2011
T comment concerns the article entitled “Water Droplet Motion Control on Superhydrophobic Surfaces: Exploiting the Wenzel-to-Cassie Transition” by Liu et al. Wetting transitions (WTs) occurring on

Design of ice-free nanostructured surfaces based on repulsion of impacting water droplets.

Factors contributing to droplet retraction, pinning and freezing are addressed by combining classical nucleation theory with heat transfer and wetting dynamics, forming the foundation for the development of rationally designed ice-preventive materials.

Slip on Superhydrophobic Surfaces

This review discusses the use of the combination of surface roughness and hydrophobicity for engineering large slip at the fluid-solid interface. These superhydrophobic surfaces were initially