Evaporation of a sessile water drop on a heated surface with controlled wettability

Gatapova, Elizaveta Ya.; Semenov, Andrey A.; Зайцев, Д. В.; Kabov, Oleg

doi:10.1016/j.colsurfa.2013.05.046

Cited by 135 publications

(37 citation statements)

References 13 publications

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“…It is seen that the specific evaporation rate increases with time (with decrease of drop volume) and at the last step of evaporation may be several times the initial value. The results are in good agreement with the findings of [7] where a comparison of the experimental and theoretical data on the dependence of the specific evaporation rate on time is presented. In contrast to [7], where the studies were carried out at a surface temperature Tw = 64 0 C, in this paper we obtain new data for the surface temperatures range from 55 to 85 0 C. The increase in the specific rate of evaporation is observed throughout the whole range of temperatures studied.…”

Section: Introductionsupporting

confidence: 81%

Evaporation of an intensively heated sessile droplet into the open atmosphere

2016

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Abstract. Evaporation of a heated sessile water drop was studied experimentally at a temperature difference between the substrate and surrounding atmosphere from 30 to 60 0 C. The studies were performed on the substrates with micro-and nanocoatings with different wettability. The features of evaporation were studied for the pinned, partially pinned and depinned contact line (solid-liquid-gas interface). It is found that during the evaporation process the specific evaporation rate (mass loss per unit of the drop surface area) increases, particularly at the last stage of the drop lifetime.

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Section: Introductionsupporting

confidence: 81%

Evaporation of an intensively heated sessile droplet into the open atmosphere

2016

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“…themocapillary instabilities as those recently discovered by Sefiane et al (2008), nor interfacial deformations, e.g. for larger drops in which gravity is not negligible as those investigated by Gatapova et al (2014). Very recently, Yang et al (2014) conducted finiteelement simulations of a fully-coupled three-phase model (solid-liquid-gas), restricted to 2D, to describe the liquid and gas flow with and without Marangoni effects.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of sessile drops: a three-dimensional approach

Sefiane²,

et al. 2015

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The evaporation of non-axisymmetric sessile drops is studied by means of experiments and three-dimensional (3D) direct numerical simulations. The emergence of azimuthal currents and pairs of counter-rotating vortices in the liquid bulk flow is reported in drops with non-circular contact area. These phenomena, especially the latter which is also observed experimentally, are found to play a critical role in the transient flow dynamics and associated heat transfer. Non-circular drops exhibit variable wettability along the pinned contact-line sensitive to the choice of system parameters, and inversely dependent on the local contact-line curvature, providing a simple criterion for estimating the approximate contact-angle distribution. The evaporation rate is found to vary in the same order of magnitude as the liquid-gas interfacial area. Furthermore, the more complex case of drops evaporating with a moving contact line in the constant contact-angle mode is addressed. Interestingly, the numerical results demonstrate that the average interface temperature remains essentially constant as the drop evaporates in the constant-angle mode, while this increases in the constant-radius mode as the drops becomes thinner. It is therefore concluded that, for increasing substrate heating, the evaporation rate increases more rapidly in the constant-radius mode than in the constant-angle mode. In other words, the higher the temperature the larger the difference between the lifetimes of an evaporating drop in the constant-angle mode with respect to that evaporating in the constant-radius mode.

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“…It can be seen that the specific evaporation rate does not change during droplet evaporation, but increases with an increase in temperature. In the case, when the droplet touches the heated surface, the specific evaporation rate is not constant; it increases drastically in the last moments of droplet existence [8,9]. The height of droplet levitation, h, was calculated as a half distance between the real droplet and its reflection ( fig.…”

Section: Investigation Resultsmentioning

confidence: 99%

Levitation of Liquid Microdroplets Above A Solid Surface Subcooled to the Leidenfrost Temperature

2016

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Abstract. Evaporation of liquid microdroplets that fall on a solid surface with the temperature of below the Leidenfrost temperature is studied. It has been found out that sufficiently small liquid droplets of about 10 microns can suspend at some distance from the surface (levitate) and do not reach the surface; at that, the rate of droplet evaporation is reduced by an order as compared to microdroplets, which touch the surface. It is determined that in contrast to microdroplets, which touch the surface, the specific evaporation rate of levitating droplets is constant in time.

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Evaporation of a sessile water drop on a heated surface with controlled wettability

Cited by 135 publications

References 13 publications

Evaporation of an intensively heated sessile droplet into the open atmosphere

Evaporation of an intensively heated sessile droplet into the open atmosphere

Evaporation of sessile drops: a three-dimensional approach

Levitation of Liquid Microdroplets Above A Solid Surface Subcooled to the Leidenfrost Temperature

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