Droplet condensation on superhydrophobic surfaces with enhanced dewetting under a tangential AC electric field

In this study, molecular dynamics simulations were carried out to study the coupling effect of electric field strength and surface wettability on the condensation process of water vapor. Our results show that an electric field can rotate water molecules upward and restrict condensation. Formed clusters are stretched to become columns above the threshold strength of the field, causing the condensation rate to drop quickly. The enhancement of surface attraction force boosts the rearrangement of water molecules adjacent to the surface and exaggerates the threshold value for shape transformation. In addition, the contact area between clusters and the surface increases with increasing amounts of surface attraction force, which raises the condensation efficiency. Thus, the condensation rate of water vapor on a surface under an electric field is determined by competition between intermolecular forces from the electric field and the surface.

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“…When the electric field strength reached 0.1 V/Å, the condensed cluster separated from the surface. This has also been found in experiment [56].…”

Section: Resultssupporting

confidence: 86%

The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

Wang

Xie

et al. 2019

Nanomaterials

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“…This is because the electrostatically charged condensation droplets are accelerated to detach from the solid surface under the application of the electric field. [ 96–98 ] It is has been demonstrated an enhanced heat transfer coefficient of 50% on a superhydrophobic CuO surface compared to conventional jumping‐droplet condensation (Figure 7f,g). [ 99 ] Last but not least, the droplet jumping from the superhydrophobic surfaces under the electric field also shows many promising applications, including self‐cleaning, [ 100 ] anti‐icing, [ 101 ] and ink‐printing.…”

Section: Electrohydrodynamic Effectmentioning

confidence: 99%

Electrohydrodynamic and Hydroelectric Effects at the Water–Solid Interface: from Fundamentals to Applications

Song

et al. 2020

Adv Materials Inter

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Electrohydrodynamic and hydroelectric effects at the water–solid interface are of fundamental importance and also underpin many important applications ranging from the controlled liquid transport by applying an external electric field to the power generation from moving liquid. Also, recent advances in micro/nanofabrication and nanomaterials provide additional dimension and flexibility in controlling electrohydrodynamic and hydroelectric effects at the water–solid interface to achieve preferred functions. Despite extensive progress, the cohesive and unified review of these two largely opposite effects is currently lacking. This review first discusses the important common foundations underpinning these two effects such as contact electrification and electric double layer (EDL), then takes a parallel approach to elaborate the electrohydrodynamic processes such as electrically induced liquid flow, wetting, and droplet motion, as well as the hydroelectricity resulting from their opposite processes. The practical applications and the unsolved challenges related to these two interfacial effects are also highlighted.

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“…Additionally, the movement of water droplets can remove dirt particles from a surface [17][18][19], which makes the surface dry and clean, thus enhancing the insulation strength of the superhydrophobic coating. Previous studies in our group have focused on the electric field-driven self-propelled motion of water droplets on a superhydrophobic surface [20], and the droplet condensation on superhydrophobic surfaces under AC electric fields has also been investigated [21]. Vallabhuneni et al showed that superhydrophobic polydimethylsiloxane sheets could maintain dielectric strength under wet conditions [22].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Pollution Flashover of a Slurry Coalescence Superhydrophobic Coating

Niu

Tian

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the pollution flashover performance of a superhydrophobic surface with different coating strategies are studied. The results show that a superhydrophobic coating is effective in preventing pollution flashover under high voltage. The superhydrophobic coatings show increased pollution flashover voltage when compared to room temperature vulcanized silicone rubber and to an uncoated glass substrate. A novel suppression mechanism of the superhydrophobic coating is proposed which is driven by the electrostatic force produced by the applied voltage. The coalesced slippery slurry droplets and the expanded dry area on the superhydrophobic surface contributes to increased flashover voltage on the superhydrophobic surface. The superhydrophobic coating promises to be a prospective application in anti-pollution performance of insulators.

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Droplet condensation on superhydrophobic surfaces with enhanced dewetting under a tangential AC electric field

Cited by 24 publications

References 31 publications

The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

The Impact of the Electric Field on Surface Condensation of Water Vapor: Insight from Molecular Dynamics Simulation

Electrohydrodynamic and Hydroelectric Effects at the Water–Solid Interface: from Fundamentals to Applications

Enhanced Pollution Flashover of a Slurry Coalescence Superhydrophobic Coating

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