Evolution of toroidal free-rim perturbations on an expanding circular liquid sheet

Ogawa, Masaki; Aljedaani, Abdulrahman B.; Li, Erqiang; Thoroddsen, Sigurður T.; Yarin, Alexander L.

doi:10.1007/s00348-018-2602-4

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…The sequence of pockets appear to rupture and not break up from the edge, as occurs later for the thicker crown (Roisman 2010; Villermaux & Bossa 2011; Ogawa et al. 2018; Wang et al. 2018).…”

Section: Resultsmentioning

confidence: 96%

“…This is followed by a radial slingshot of spray, shown at t = 87 μs. The sequence of pockets appear to rupture and not break up from the edge, as occurs later for the thicker crown (Roisman 2010;Villermaux & Bossa 2011;Ogawa et al 2018;Wang et al 2018). The exact nature of the ruptures of sub-micron liquid films is still a subject of debate (Villermaux 2020), but the presence of micro-bubbles is known to assist with the rupturing of such pockets (Thoroddsen et al 2004).…”

Section: Cascade Of Tip Bendingsmentioning

confidence: 89%

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Dancing ejecta

Tian,

Aljedaani,

Alghamdi

et al. 2024

J. Fluid Mech.

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Splashing of impacting drops produces a myriad of secondary spray droplets, which generate aerosols during rain on the ocean and can cause health hazards during the spraying of pesticides or enhance the droplet transmission of disease. Determining the size and number of the finest splashed droplets is therefore of practical interest. Herein, we use a novel experimental facility with a 26 m tall vacuum tube, to study well-controlled drop impacts at velocities as high as 22 m s $^{-1}$ , where we reach parameter regimes not studied before using freely falling drops. Using extreme video frame rates, we pinpoint the primary source of the finest spray, coming from the catastrophic bending and rupture of the sub-micron-thick ejecta sheet, which emerges at a high speed from the neck connecting the drop and pool. The axisymmetric bending and convoluted ejecta shapes are driven primarily by resistance from the surrounding air, but also depend on the viscosity difference between drop and pool, which influences the initial ejection angle of the sheet. These extreme impact conditions provide new insights into general spray formation, through a sequence of bucklings of the rising ejecta, which dances next to the drop surface and can also form an enclosed air torus.

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