Retraction dynamics of a water droplet impacting onto a microgrooved hydrophobic surface at different velocities and surface temperatures

Fan, Yee Li; Zhan, Zhaoyao; Chen, Guo; Kim, Jeonghyun; Lee, Jinkee

doi:10.1016/j.ijheatmasstransfer.2020.120851

Cited by 12 publications

(2 citation statements)

References 35 publications

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“…There are two parameters defined to describe the spreading dynamics and the effect of inertial, viscous, and capillary forces: the Weber number [ We = ρ ( v 0 ) 2 D 0 / γ ] and the Reynolds number [ Re = ρ v 0 D 0 / μ ], where ρ is the density of the droplet, v 0 is the impinging velocity, D 0 is the initial droplet diameter before impinging, γ is the surface tension, and μ is the liquid viscosity of the droplet. If different values of We and Re are given, a droplet after impinging on a solid surface will exhibit a variety of output forms such as spreading, retraction, rebound, breakup, and splash. − …”

Section: Introductionmentioning

confidence: 99%

Diameter-Optimum Spreading for the Impinging of Water Nanodroplets on Solid Surfaces

Tan

Guo

2023

Langmuir

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The impinging of water nanodroplets on solid surfaces is crucial to many nanotechnologies. Through large-scale molecular dynamics simulations, the size effect on the spreading of water nanodroplets after impinging on hydrophilic, graphite, and hydrophobic surfaces under low impinging velocities has been systematically studied. The spreading rates of nanodroplets first increase and then decrease and gradually become constant with the increase of nanodroplet diameter. The nanodroplets with the diameters of 17–19 nm possess the highest spreading rates because of the combined effect of the strongest interfacial interaction and the strongest surface interaction within water molecules. The highest water molecule densities, hydrogen bond numbers, and dielectric constants of interface and surface layers mainly contribute to the lowest interface work of adhesion and surface tension values at optimal diameters. These results unveil the nonmonotonic characteristics of spreading velocity, interface work of adhesion and surface tension with nanodroplet diameter for nanodroplets on solid surfaces.

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Section: Introductionmentioning

confidence: 99%

Diameter-Optimum Spreading for the Impinging of Water Nanodroplets on Solid Surfaces

Tan

Guo

2023

Langmuir

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“…They found spreading factor increased with droplet velocity. Fan et al (2021) numerically simulated droplet impact with varies velocity onto a micro grooved hydrophobic with varies temperature of surface. Xia et al (2021) experimentally investigated water droplet impact on the super-hydrophobic surface with laser treatment.…”

Section: Introductionmentioning

confidence: 99%

3D numerical simulation of flap geometry optimization around the cylinder to collection of split up droplet

Alishah¹,

Maddah²,

Alinejad³

et al. 2021

Fluid Dyn. Res.

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The novelty of present work is surveying deformation, split up and remained volume of Newtonian droplet impact with diameter d = 1.6, 2 and 2.4 mm and the droplet velocity in v = 1 and 2 m s −1 around the solid cylinders without flap, with simple and angle flap. Three-dimensional simulation was based on the volume of fluid method with dynamic contact angle of droplet and validated with the experimental results of a droplet impact and spread over the edge surface. Comparison split up volume of droplet between cylinder without flap, with simple and angle flap, the least percentage of split up volume of droplet (16%) was on solid cylinder with angle flap for droplet d = 1.6 mm and v = 1 m s −1 . Also, the maximum remained volume of droplet (5.1781 × 10 −9 m 3 ) was on the solid cylinder with angle flap for droplet d = 2.4 mm and v = 1 m s −1 .

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The effect of vibration on droplet dynamics and heat transfer of spray cooling

Chen,

Du,

Wang

et al. 2024

Applied Thermal Engineering

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Retraction dynamics of a water droplet impacting onto a microgrooved hydrophobic surface at different velocities and surface temperatures

Cited by 12 publications

References 35 publications

Diameter-Optimum Spreading for the Impinging of Water Nanodroplets on Solid Surfaces

Diameter-Optimum Spreading for the Impinging of Water Nanodroplets on Solid Surfaces

3D numerical simulation of flap geometry optimization around the cylinder to collection of split up droplet

The effect of vibration on droplet dynamics and heat transfer of spray cooling

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