Levitation and Self-Organization of Liquid Microdroplets over Dry Heated Substrates

Зайцев, Д. В.; Kirichenko, Dmitry P.; Ajaev, Vladimir S.; Kabov, Oleg

doi:10.1103/physrevlett.119.094503

Cited by 49 publications

(37 citation statements)

References 18 publications

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“…Consequently, when considered in the modeling, Stefan flow results in elevated evaporation rates. Contribution of Stefan flow to the evaporation rates and its effect on the gas flow field were experimentally assessed by several recent studies (Zaitsev et al, 2017;Kabov et al, 2017;Misyura, 2017Misyura, , 2018. Moreover, empirical model of Carle et al (2016) was utilized to show the effect of Stefan flow on evaporation rates for a certain drop configuration.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Stefan Flow on the Models of Droplet Evaporation

Akkuş

2020

Isı Bilimi Ve Tekniği Dergisi

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Droplet evaporation has been widely studied in the literature due to its key role in various applications in science and industry. The problem of droplet evaporation involves various mechanisms in both liquid and vapor phases together with the interface separating them. Modeling of this multiphase problem is not straightforward thereof studied by many researchers but in every time a few different contributing mechanisms could be highlighted. One of the pieces of this puzzle is undoubtedly the Stefan flow, which is always present during the evaporation of a liquid to an insoluble surrounding gas, yet the number of studies exploring its individual contribution to the evaporation remain very restricted. In the current study, the effect of Stefan flow is assessed by employing a recent state-of-the-art model that accounts for all pertinent physics of droplet evaporation. Results reveal that Stefan flow can be responsible for 17% of total evaporation when the droplet is placed on a high temperature substrate. Moreover, it is shown that lower performance of diffusion based models (in gas phase) can be greatly enhanced by incorporating the effect of Stefan flow into the interfacial mass flux equation. In addition, performances of existing purely diffusion and diffusion and Stefan flow based correlations in the prediction of evaporation rates are elucidated. Last but not least, under varying humidity of the surrounding gas, contribution of individual transport mechanisms in gas phase to the total evaporation rate is found to be unaffected. Based on this result, it is hypothesized that contributions of Stefan flow and natural convection have a linear dependence on the contribution of sole diffusion. The current study clearly demonstrated that Stefan flow considerably enhances the evaporation rate of droplets, especially in the case of high substrate heating. Therefore, future studies on the topic should account for the Stefan flow during the modeling of droplet evaporation.

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Section: Introductionmentioning

confidence: 99%

The Effect of Stefan Flow on the Models of Droplet Evaporation

Akkuş

2020

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“…Droplet levitation over hot liquid-gas interfaces [5][6] can have a significant effect on the performance of twophase cooling systems. Experimental studies of microdroplets levitation over a dry solid surface with relatively low temperature have been conducted in the works [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Levitation of liquid microdroplets over a dry heated substrate near triple-phase contact line

2018

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Levitating droplets of liquid condensate are known to organize themselves into ordered arrays over hot liquid-gas interfaces. We report experimental observation of similar behaviour over a dry heated substrate in the vicinity of the triple-phase contact line with high local evaporation rate. It was found that there is an area near the contact line, where no levitating droplets are observed. The width of this area increases with the substrate temperature. Also, it was found that the distance between adjacent levitating droplets increases with the temperature.

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“…It is necessary to control their spatial distribution and spreading when they impact the surface in order to prevent the merging of adjacent drops. A drop spreading over a solid surface is found to depend on the gravity forces, inertia, viscosity, friction and surface tension [7][8][9][10]. The weight of the drop affects the gravity force; liquid composition affects the viscous friction force and surface tension; mass of liquid and surface roughness on mechanical friction.…”

Section: Introductionmentioning

confidence: 99%