Droplet splashing on curved substrates

Sykes, Thomas C.; Fudge, Ben D.; Quetzeri-Santiago, Miguel A.; Castrejón‐Pita, J. R.; Castrejón‐Pita, Alfonso A.

doi:10.1016/j.jcis.2022.01.136

Cited by 15 publications

(11 citation statements)

References 45 publications

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“…The purple band delineates the equivalent dry surface () splashing threshold (Sykes et al. 2022), which spans a small vertical interval encompassing the range of found in our experiments.…”

Section: Resultssupporting

confidence: 50%

“…Within the lamella regime, few experiments produce satellites for (see figure 4, where the vast majority of red markers are triangles), whereas (purple band in figure 4) is the dry flat surface splashing threshold (Sykes et al. 2022). This observation offers a potential route to reducing contamination from satellite droplets due to droplet impact, by applying a sufficiently thin layer of the same fluid to the surface.…”

Section: Resultsmentioning

confidence: 99%

“…The radius of curvature at the bottom of the droplet mm was measured, with (the effective droplet diameter, ) taken as the characteristic length scale (see Sykes et al. 2022). We non-dimensionalise lengths, velocities and time using , and , respectively.…”

Section: Methodsmentioning

confidence: 99%

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Droplet impact dynamics on shallow pools

Sykes,

Cimpeanu,

Fudge

et al. 2023

J. Fluid Mech.

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When a fast droplet impacts a pool of the same fluid, a thin ejecta sheet that dominates the early-time dynamics emerges within the first few microseconds. Fluid and impact properties are known to affect its evolution; we experimentally reveal that the pool depth is a critical factor too. Whilst ejecta sheets can remain separate and subsequently fold inwards on deeper pools, they instead develop into outward-propagating lamellae on sufficiently shallow pools, undergoing a transition that we delineate by comprehensively varying impact inertia and pool depth. Aided by matching direct numerical simulation results, we find that this transition stems from a confinement effect of the pool base on the impact-induced pressure, which stretches the ejecta sheet to restrict flow into it from the droplet on sufficiently shallow pools. This insight is also applied to elucidate the well-known transition due to Reynolds number.

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“…The purple band delineates the equivalent dry surface () splashing threshold (Sykes et al. 2022), which spans a small vertical interval encompassing the range of found in our experiments.…”

Section: Resultssupporting

confidence: 50%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Droplet impact dynamics on shallow pools

Sykes,

Cimpeanu,

Fudge

et al. 2023

J. Fluid Mech.

Self Cite

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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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“…Minimizing splashing requires knowledge about microjet impact behavior and how this relates to jet break-up. Droplet splashing has been extensively characterized [36][37][38][39][40][41][42][43][44][45], and it has been shown to depend on the substrate, liquid characteristics, and ambient pressure [36,37,46,47]. Furthermore, it is known that microscale droplets show different impact behavior compared to macroscale droplets as the rim of liquid formed after the impact becomes comparable to the mean free path of air molecules [48][49][50].…”

Section: Introductionmentioning

confidence: 99%