A Study of the Evaporation of Hexane Lenses on an Ionic Liquid Surface: Effect of Wetting Mode

Liu, Lu; Xu, Chuang; Zhu, Meng; Jiang, Jian; Mi, Menglong

doi:10.1021/acs.langmuir.9b03616

Cited by 4 publications

(16 citation statements)

References 32 publications

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“…As the density ratio increases, α decreases, resulting in the decrease of the area of the upper interface of the lens, that is, the effective evaporation area decreases, so the mass evaporation rate decreases. This is consistent with our previous experimental observation 16 that the lens evaporation time was significantly prolonged when the lens created a “pit” in the liquid substrate.…”

Section: Resultssupporting

confidence: 93%

Lens Evaporation on Immiscible Liquid Surface with an Interfacial Cooling Effect

Jiang

Zhang

et al. 2022

ACS Omega

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A theoretical heat and mass transfer model of volatile liquid lens evaporation on the surface of an immiscible liquid substrate is established in toroidal coordinates. According to the coupled boundary conditions of heat and mass transfer at the lens surface as well as the interfacial cooling effect, the analytical solutions of the temperature field inside the lens and the vapor concentration field around the lens are derived for the first time. Compared with the isothermal model, the change of contact radius calculated by the present model agrees well with the experimental data, especially when the liquid substrate reaches a relatively high temperature. It also reveals that the temperature distribution inside the lens is not uniform, which is similar to the sessile droplet evaporation on a solid substrate surface. In addition, the excess temperature, heat flux, and evaporation flux of the lens–air interface increase monotonically from the lens center to the contact line. Finally, the influences of density ratio and evaporative cooling number E 0 on lens mass evaporation rate are analyzed, which shows that the lens mass evaporation rate decreases with increasing density ratio and evaporative cooling number.

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Section: Resultssupporting

confidence: 93%

Lens Evaporation on Immiscible Liquid Surface with an Interfacial Cooling Effect

Jiang

Zhang

et al. 2022

ACS Omega

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“…Figure shows a schematic diagram of the experimental system. A plastic Petri dish of 60 mm in diameter and 15 mm in height was filled with ionic liquid at a depth of 4 mm, which is deeper than the depth of 2.6 mm used in our previous study . The change in the depth of ionic liquid is because the container bottom will affect the lens morphology when the height of the ionic liquid is too low.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The theoretical model assumptions are as follows: (1) The spreading stage is ignored because it accounts for <10% of the lens lifetime. − (2) The temperature change due to lens evaporation is ignored because the lens temperature and the substrate liquid temperature are close to the ambient temperature.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The influence of lens evaporation on its morphology evolution is considered in the present model, and the lens mass evaporation rate is calculated by using the following equation ,, where D is the diffusion coefficient and C s and C ∞ are the vapor densities at the lens surface and in ambient air, respectively. The value of C ∞ is set to 0 in this Article.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…They found that the droplet evaporation process experiences an advancing stage and a receding stage and follows the CCA evaporation mode during the receding stage. In our previous studies, , the process for a hexane droplet evaporation on a deionized water surface and an ionic liquid ([BMIm]PF 6 ) surface was experimentally studied, and the droplet mass change under the CCA evaporation mode was estimated by the diffusion-controlled evaporation model. The results showed that the bending of the liquid substrate surface accelerates the droplet evaporation.…”

Section: Introductionmentioning

confidence: 99%

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Morphology Evolution of a Volatile Liquid Lens on Another Immiscible Liquid Surface Induced by Evaporation

et al. 2021

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A theoretical model was established to predict the morphology evolution of a volatile liquid lens evaporation on another immiscible liquid substrate surface. The theoretical model considered the dynamic process of contact line motion. On the basis of the boundary conditions established at the contact line, the morphology change of the liquid lens was calculated by numerically solving the Young–Laplace differential equations for the three interfaces. The mass evaporation rate was calculated by the diffusion-controlled evaporation model. Then, an experimental system was established to record the process of a hexane lens evaporation on the surface of an ionic liquid with a depth of 4 mm. The calculated hexane lens radius variation matches well with the experimental measurements, which shows the rationality of the present model. The calculated results show that the evaporation pattern of the liquid lens follows the constant contact-angle evaporation mode for ∼70% of the lifetime. During the later stage of evaporation, the contact angle decreases, accompanied by contraction of the contact line, which is similar to the mixed evaporation mode in the later stage of sessile droplet evaporation on a solid substrate surface. Furthermore, the influences of the initial hexane lens volume and the ionic liquid temperature on the dynamic contact angle were theoretically summarized. This study helps to provide in-depth insights into regulating the lens evaporation process on another immiscible liquid substrate surface to control the particle deposition mode.

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Theoretical and Numerical Studies of Liquid Lens Evaporation with Coupled Fields

Shen

Wang

et al. 2022

Ind. Eng. Chem. Res.

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The evaporation of the liquid lens on an immiscible liquid is widely adopted in many industrial and scientific applications, so it is crucial to predict the evaporation rate and lifetime of the liquid lens. During the evaporation, the internal thermocapillary flow, external natural convection, and interfacial evaporative cooling are coupled together and affect the evaporation characteristics greatly. In this paper, the slow and fast evaporation with coupled fields are studied by theoretical analysis and numerical simulation, respectively. It is found that the evaporative cooling can always inhibit the liquid lens evaporation, while the thermocapillary flow and natural convection can enhance the liquid lens evaporation. The total evaporation rate is determined by the competence between the interfacial evaporative flux and upper surface of the liquid lens. With the increasing liquid lens volume, the total evaporation rate will generally increase for fast evaporation, while for slow evaporation that only considers the evaporative cooling effect, the total evaporation rate may decrease at a low tangential angle ratio. The evaporation of the liquid lens follows the constant contact angle mode, the transient variation of volume satisfies the "2/3 law", independent of evaporative cooling, thermocapillary flow, and natural convection, and it is analogous to the sessile droplet evaporation in constant contact angle mode. These findings can provide guidance for the wide application of liquid lens evaporation.

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A Study of the Evaporation of Hexane Lenses on an Ionic Liquid Surface: Effect of Wetting Mode

Cited by 4 publications

References 32 publications

Lens Evaporation on Immiscible Liquid Surface with an Interfacial Cooling Effect

Lens Evaporation on Immiscible Liquid Surface with an Interfacial Cooling Effect

Morphology Evolution of a Volatile Liquid Lens on Another Immiscible Liquid Surface Induced by Evaporation

Theoretical and Numerical Studies of Liquid Lens Evaporation with Coupled Fields

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