Experimental Investigation of Water Droplet Impact on the Electrospun Superhydrophobic Cylindrical Glass: Contact Time, Maximum Spreading Factor, and Splash Threshold

Borjak, Sedigheh Khanzadeh; Rafee, Roohollah; Valipour, Mohammad Sadegh

doi:10.1021/acs.langmuir.0c02228

Cited by 28 publications

(11 citation statements)

References 49 publications

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“…Among that, the droplet dynamics on a spherical substrate are relatively perspicuous owing to the regular annulus-symmetry of the fluid dynamics. − Conversely, on a cylindrical surface, the corresponding impact dynamics are more complex since the substrate breaks down the annulus symmetry. − Once a droplet touches the substrate, it would spread both in the axial and azimuthal directions, with the latter commonly being presented along the periphery extended from the impact point. − By doing so, the droplet dynamics with rotational symmetry on a horizontal or spherical surface can be transformed into that with planar symmetry. Such impact is quite common in nature and various industrial processes, like raindrops hitting wires or liquid impinging nanotubes in a microfluidic chip, which has attracted increasing attention in recent years. − ,− …”

Section: Introductionmentioning

confidence: 99%

Impact Dynamics of a Single Droplet on Hydrophobic Cylinders: A Lattice Boltzmann Study

Zhang

Wang

et al. 2022

Langmuir

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This study numerically investigates the effects of the Weber number (We) and cylinder-to-droplet radius ratio (R*) on the impact dynamics of a lowviscosity droplet on a hydrophobic cylinder by the lattice Boltzmann method. The intrinsic contact angle of the surface is chosen as θ 0 = 122°± 2°, which ensures a representative hydrophobicity. The regime diagram of the impact dynamics in the parameter space of We versus R* is established with categories of split and nonsplit regimes. The droplet would split during impact as α = We/R* exceeds a critical value. In the nonsplit regime, the droplet bounces off the cylinder at most Weber numbers unless the impact velocity is minuscule (We < 2). The contact time of the droplet on the cylinder surface decreases with increasing R* or decreasing We, indicating bouncing is facilitated under such conditions. This can be explained by the suppressed adhesion dissipation between the droplet and surface due to a reduction in the contact area. In the split regime, sufficient kinetic energy inside the impacting droplet determines whether the whole droplet could detach from the surface. With a small cylinder (R* < 0.83) and large We (>25), the adhesion effect is weakened for the side fragments because of the small contact area, and it facilitates the dripping of fragments. For other conditions, the detachment, especially for the tiny droplet on the cylinder top, only occurs if the deformation is prominent at We > 35. Moreover, the spreading dynamics of the impacting droplet are also highlighted in this work.

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Section: Introductionmentioning

confidence: 99%

Impact Dynamics of a Single Droplet on Hydrophobic Cylinders: A Lattice Boltzmann Study

Zhang

Wang

et al. 2022

Langmuir

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“…illustrated that the contact time of drops impacting a nickel-wire-based macrotexture exhibits discrete values when varying the impact speed . Khanzadeh Borjak et al reported that the contact time on superhydrophobic TiO 2 -decorated cylindrical glass is up to 50% less than that on flat glass . In a word, compared with ordinary rigid SHSs, the introduction of macroscopic structures on SHSs can alter the dynamics of water impacting, thus significantly reducing the contact time and providing great potential for self-cleaning and anti-icing applications.…”

Section: Enhanced Water Repellency On Elastic Substratementioning

confidence: 99%

Enhanced Surface Icephobicity on an Elastic Substrate

Jamil

et al. 2021

Langmuir

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“… Khanzadeh Borjak et al. (2020) used a high-speed camera to study the bouncing process of water droplets on a cylinder of SH glass ( Figures 8 A and 8B).…”

Section: Removing Surface Water Droplets Before Freezingmentioning

confidence: 99%

“…(F) Splash-rebound: SH cylindrical sample, We = 161. Image reprinted with permission from Khanzadeh Borjak et al. (2020) .…”

Section: Removing Surface Water Droplets Before Freezingmentioning

confidence: 99%

Superhydrophobic materials used for anti-icing Theory, application, and development

Guo

2021

iScience

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Summary The accumulation of ice will reduce the performance of the base material and lead to all kinds of damage, even a threat to people's life safety. Recent increasing studies suggest that superhydrophobic surfaces (SHSs) originating from nature can remove impacting and condensing droplets from the surface before freezing to subzero temperatures, and it can be seen that hydrophobic/SH coating has good freezing cold resistance. But such anti-icing performances and developments in practical applications are restricted by various factors. In this paper, the mechanism and process of surface icing phenomenon are introduced, as well as how to prevent surface icing on SHS. The development of SH materials in the aspect of anti-icing in recent years is described, and the existing problems in the aspect of anti-icing are analyzed, hoping to provide new research ideas and methods for the research of anti-icing materials.

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Experimental Investigation of Water Droplet Impact on the Electrospun Superhydrophobic Cylindrical Glass: Contact Time, Maximum Spreading Factor, and Splash Threshold

Cited by 28 publications

References 49 publications

Impact Dynamics of a Single Droplet on Hydrophobic Cylinders: A Lattice Boltzmann Study

Impact Dynamics of a Single Droplet on Hydrophobic Cylinders: A Lattice Boltzmann Study

Enhanced Surface Icephobicity on an Elastic Substrate

Superhydrophobic materials used for anti-icing Theory, application, and development

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