Leidenfrost Effect and Surface Wettability

Agrawal, Prashant; McHale, Glen

doi:10.1007/978-3-030-82992-6_7

Cited by 3 publications

(2 citation statements)

References 143 publications

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“…Also, an enhanced way to manipulate water droplets on three different lateral shapes of asymmetric sawteeth topography was introduced by using the sound of boiling droplet [22]. However, the driving mechanisms of this self-propelled motion are still under debate and only a few computational modeling studies have been done so far to our knowledge [23,24].…”

Section: Background and Research Scopesmentioning

confidence: 99%

A Simplified Model for the Study of Film-Boiling Droplet Motion on Microscale Ratchets

Wang,

Ok,

Park

et al. 2024

Applied Mechanics

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In this work, we explore a simplified model based on both analytical and computational methods for the study of film-boiling droplet motion on microscale ratchets. We consider a specific ratchet design with the length periods and depth of ratchets much smaller than the size of the droplet. We conclude based on our modeling that for the ratchet configuration considered in this paper, the conduction within the vapor film is the dominant means of heat transfer in comparison with convection and radiation. Furthermore, we demonstrate a more manageable two-dimensional model in which analytical approaches coupled with computational approaches yield reasonably accurate results in comparison to the actual experiments.

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Section: Background and Research Scopesmentioning

confidence: 99%

A Simplified Model for the Study of Film-Boiling Droplet Motion on Microscale Ratchets

Wang,

Ok,

Park

et al. 2024

Applied Mechanics

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“…The classic boiling process, which is characterized by the onset of nucleate boiling, transition boiling, and film boiling in sequence with increasing surface temperature, is widely used in various industrial processes ( 1 – 5 ). Both nucleate boiling and transition boiling exist in an unstable state, which is characterized by violent disturbances at the substrate/water interface.…”

mentioning

confidence: 99%

A standing Leidenfrost drop with Sufi whirling

Yang

Wang

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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When a water drop is placed on a hot solid surface, it either undergoes explosive contact boiling or exhibits a stable state. In the latter case, the drop floats over an insulating layer of vapor generated by rapid vaporization of water at the surface/drop interface; this is known as the Leidenfrost state. Here, we discuss a previously unrecognized steady state in which a water drop “stands” on a hot smooth surface. In this state, the drop stabilizes itself with partial adhesion on the hot surface, leading to unique deformation and rotation behavior reminiscent of Sufi whirling—a form of spinning dance. Our analysis of this standing Leidenfrost state reveals the underlying mechanisms that drive the drop’s stable partial adhesion and subsequent deformation with rotation. The heat-transfer efficiency of this standing state is up to 390% greater than that of the traditional floating Leidenfrost state.

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