Evaporating hydrophilic and superhydrophobic droplets in electric fields

Gibbons, Michael; Garivalis, Alekos Ioannis; O’Shaughnessy, S.M.; Marco, Paolo Di; Robinson, A.J.

doi:10.1016/j.ijheatmasstransfer.2020.120539

Cited by 32 publications

(15 citation statements)

References 37 publications

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“…The adhesion force is far greater than the cohesion of water, and spontaneous aggregation is difficult, which is why the pollution is closely adhered to the material surface. According to the theory of electro-elasto-capillarity dynamics [40][41][42], the variation in solid-liquid coexistence on the material surface is related to the surface tension of the liquid and the elastic deformation parameters of the solid. When the pollution is in an electric field, the surface tension of the liquid tends to increase [43].…”

Section: Principle Hypothesis Of Self-aggregation At Low Humiditymentioning

confidence: 99%

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

et al. 2022

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Self-cleaning is the key factor that makes superhydrophobic nanostructured materials have wide applications. The self-cleaning effect, however, strongly depends on formations and movement of water droplets on superhydrophobic nanostructured surfaces, which is greatly restricted at low humidity (< 7.6 g•kg −1 ). Therefore, we propose a self-cleaning method at low humidity in which the pollution is electro-aggregated and driven in the electric field to achieve the aggregation and cleaning large areas. The cleaning efficiency of this method is much higher than that of water droplet roll-off, and will not produce " pollution bands" . A simplified numerical model describing pollution movements is presented. Simulation results are consistent with experimental results. The proposed method realizes the self-cleaning of superhydrophobic nanostructured surfaces above dew point curve for the first time, which extends applications of superhydrophobic nanostructured materials in low humidity, and is expected to solve self-cleaning problems of outdoor objects in low humidity areas (< 5.0 g•kg −1 ).

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Section: Principle Hypothesis Of Self-aggregation At Low Humiditymentioning

confidence: 99%

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

et al. 2022

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“…However, the intensity of droplet evaporation was higher on the hydrophilic surface, which is due to the greater length of the contact line and the contact area of the droplet with the substrate, while on the superhydrophobic surface, higher average heat flux was observed, due to the greater density of the contact line length. The influence of the electric field on the process of heat and mass transfer during the evaporation of liquid droplets both on hydrophilic and superhydrophobic heated surfaces was studied in [7]. The authors concluded that the electric field significantly affects heat and mass transfer only with an increase in the density of the length of the contact line due to a change in the shape of the evaporating drop, since the density of the length of the contact line is responsible for the average heat flux under the drop.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of a sessile droplet pinned by a groove on a heated substrate

Kunts

Kochkin

Kabov

2022

J. Phys.: Conf. Ser.

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The process of evaporation of sessile water droplets on a heated substrate was experimentally studied. A droplet evaporation is a fundamental phase change process which requires thorough consideration in various conditions. In this work we investigated the evaporation of water droplets on the smooth copper substrate with a circle groove made on its surface, which helped to keep the sessile droplet stable. Thus, the contact area of the evaporating droplet with the substrate remained constant, while the contact angle varied over a wide range. The experiment was conducted with a help of Krüss DSA100.

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“…However, the above study did not consider the effect of electric field. When a voltage is applied to a superhydrophobic material, the charge will accumulate on the surface due to the dielectric properties of the material [27,28]. Especially in the DC electric field, positive charges move in the direction of the electric field and the surface is more prone to charge accumulation, which can affect the distribution characteristics of pollution on the surface [29,30].…”

Section: Introductionmentioning

confidence: 99%

Pollution morphology characteristics on a superhydrophobic surface and its pollution flashover voltage in DC electric field

et al. 2021

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To solve the pollution problem of insulators on ultra‐high voltage DC transmission lines, superhydrophobic coatings were presented and their pollution deposit morphology and pollution flashover voltage in electric field were studied by an artificial pollution deposit system. The experimental results show that the pollution on the surface of superhydrophobic coating is distributed in clusters, which inhibits the chain distribution on the surface of silicone rubber and improves the pollution flashover voltage. Secondly, the competition mechanism of the pollution flashover on the superhydrophobic coating surface was found. This competition mechanism can lead to the failure of the insulation performance of the superhydrophobic coating in severely polluted environments. Finally, a pollution flashover model of superhydrophobic coating is proposed to explain the competition mechanism, which is affected by pollution and the discrete droplets. The conclusions of this study can provide an experimental and theoretical basis for the application of the superhydrophobic coating in the field of UHV DC external insulation.

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Evaporating hydrophilic and superhydrophobic droplets in electric fields

Cited by 32 publications

References 37 publications

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

Evaporation of a sessile droplet pinned by a groove on a heated substrate

Pollution morphology characteristics on a superhydrophobic surface and its pollution flashover voltage in DC electric field

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