The Leidenfrost Point: Experimental Study and Assessment of Existing Models

Bernardin, John D.; Mudawar, Issam

doi:10.1115/1.2826080

Cited by 341 publications

(212 citation statements)

References 45 publications

(42 reference statements)

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“…In general, the Leidenfrost state has been found to be governed by surface chemical properties such as surface energy and composition; thermo-physical properties such as density and thermal conductivity; and also topographic characteristics of the surface the liquid is in contact with (liquid/solid interface). Many studies have shown the Leidenfrost point (LFP) for water on polished stainless steel to be between 280 and 320 O C [1]- [7]; such results have been summarized by Bernardin and Mudawar [7]. Additionally, it has been shown that manipulating surface roughness and nanoporosity can lead to increased wettability, which in turn will increase the LFP [8]- [15].…”

Section: Introductionmentioning

confidence: 90%

Effects of droplet diameter on the Leidenfrost temperature of laser processed multiscale structured surfaces

Hassebrook

Kruse

Wilson

et al. 2014

Fourteenth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)

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In this paper, an experimental investigation of the effects of droplet diameters on the Leidenfrost temperature and its shifts has been carried out. Tests were conducted on a 304 stainless steel polished surface and a stainless steel surface which was processed by a femtosecond laser to form Above Surface Growth (ASG) nano/microstructures. To determine the Leidenfrost temperatures, the droplet lifetime method was employed for both the polished and processed surfaces. A precision dropper was used to vary the size of droplets from 1.5 to 4 millimeters. The Leidenfrost temperature was shown to display shifts as high as 85 O C on the processed surface over the range of droplet sizes, as opposed to a 45 O C shift on the polished surface. The difference between the shifts was attributed to the nature of the force balance between dynamic pressure of droplets and vapor pressure of the insulating vapor layer.

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Section: Introductionmentioning

confidence: 90%

Effects of droplet diameter on the Leidenfrost temperature of laser processed multiscale structured surfaces

Hassebrook

Kruse

Wilson

et al. 2014

Fourteenth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)

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“…as well as the gravity, the gas pressure, the liquid flow rate, etc. One can find in the articles of Bernardin et al [4][5][6] a complementary bibliographical review on this subject. In fact, previous research works have generally ignored the effects of the gas pressure on the T N Temperature and the available Leidenfrost temperature models have not met reasonable success.…”

Section: Estimation Of T N and T L Temperaturesmentioning

confidence: 99%

“…This interaction of spray with the wall involves different physical phenomena according to the conditions of impact (speed of the droplets, temperature of the wall, roughness of the surface, etc.) and of the pressure of gases in the combustion chamber [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Model for Liquid Film Boiling in Internal Combustion Engines

Habchi

2010

Oil Gas Sci. Technol. – Rev. IFP

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Résumé -Un modèle complet pour l'ébullition de film liquide dans les moteurs à combustion interne -Dans cet article, les principaux processus physiques, régissant les régimes d'ébullition nucléée et de transition d'un film liquide, ont été examinés à partir des observations expérimentales disponibles dans la littérature. Les tendances physiques observées, ont été utilisées, pour développer un modèle phénoménologique complet pour l'ébullition de film liquide (LFB). Celui-ci permet le calcul de sa vaporisation, dans le régime d'ébullition nucléée, ainsi que, dans le régime d'ébullition de transition. Ces régimes sont identifiés par les températures de saturation, de Nukiyama et de Leidenfrost. L'estimation des températures de Nukiyama et de Leidenfrost, en fonction de la pression de gaz ambiante, a requis une attention toute particulière. Plusieurs courbes de durée de vie, de gouttes de grosse taille déposées sur une surface chaude dans diverses conditions, ont été choisies parmi celles qui sont disponibles dans la littérature récente pour la validation du modèle LFB. Les résultats numériques montrent que les ordres de grandeur et les tendances observées expérimentalement sont bien respectés. En particulier, le modèle LFB reproduit bien la disparition progressive du régime de Leidenfrost avec des pressions suffisamment élevées du gaz. D'autre part, l'augmentation progressive du taux de vaporisation du liquide avec la rugosité du mur, précédemment observée expérimentalement près du point de Leidenfrost, a été correctement prédite par le modèle LFB. Abstract -A Comprehensive Model for Liquid Film Boiling in Internal Combustion Engines -In this paper, the main physical processes governing the nucleate and transition regimes of the boiling of a liquid film were reviewed from the available experimental observations in the literature. The physical tendencies observed in most experiments have been used to develop a comprehensive phenomenological Liquid Film Boiling (LFB) model which allows the calculation of the vaporization of liquid films in the

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“…At higher temperatures, the droplets exhibit the classical Leidenfrost phenomenon 7,8 , where solidliquid contact is absent because of the presence of a thin vapour layer (thickness E10-100 mm) 9 that completely separates the droplet from the heated surface [10][11][12][13] . The reported values of the Leidenfrost temperature on a flat silicon surface ranges from 200 to 390°C 9,[14][15][16][17][18] . Although the majority of the studies on textured surfaces report a relative increase in the Leidenfrost temperature 10,14,[18][19][20][21][22] , a few recent studies reported a significant decrease in the Leidenfrost temperature on microstructured hydrophobic surfaces [23][24][25][26] .…”

mentioning

confidence: 99%

“…The reported values of the Leidenfrost temperature on a flat silicon surface ranges from 200 to 390°C 9,[14][15][16][17][18] . Although the majority of the studies on textured surfaces report a relative increase in the Leidenfrost temperature 10,14,[18][19][20][21][22] , a few recent studies reported a significant decrease in the Leidenfrost temperature on microstructured hydrophobic surfaces [23][24][25][26] . For example, del Cerro et al 23 observed suspended droplets on heated surfaces composed of hydrophobic micropillars and microholes at temperatures 70% lower than the Leidenfrost point on a smooth surface.…”

mentioning

confidence: 99%

Non-wetting droplets on hot superhydrophilic surfaces

et al. 2013

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Controlling wettability by varying surface chemistry and roughness or by applying external stimuli is of interest for a wide range of applications including microfluidics, drag reduction, self-cleaning, water harvesting, anti-corrosion, anti-fogging, anti-icing and thermal management. It has been well known that droplets on textured hydrophilic, that is superhydrophilic, surfaces form thin films with near-zero contact angles. Here we report an unexpected behaviour where non-wetting droplets are formed by slightly heating superhydrophilic microstructured surfaces beyond the saturation temperature (45°C). Although such behaviour is generally not expected on superhydrophilic surfaces, an evaporation-induced pressure in the structured region prevents wetting. In particular, the increased thermal conductivity and decreased vapour permeability of the structured region allows this behaviour to be observed at such low temperatures. This phenomenon is distinct from the widely researched Leidenfrost and offers an expanded parametric space for fabricating surfaces with desired temperature-dependent wettability.

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The Leidenfrost Point: Experimental Study and Assessment of Existing Models

Abstract: This study presents a detailed and thorough parametric study of the Leidenfrost point (LFP)

Cited by 341 publications

References 45 publications

Effects of droplet diameter on the Leidenfrost temperature of laser processed multiscale structured surfaces

Effects of droplet diameter on the Leidenfrost temperature of laser processed multiscale structured surfaces

A Comprehensive Model for Liquid Film Boiling in Internal Combustion Engines

Non-wetting droplets on hot superhydrophilic surfaces

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