Banded Structures in the Distribution Pattern of a Drop over the Surface of the Target Fluid

Chashechkin, Yu. D.; Ilinykh, A. Yu.

doi:10.1134/s1028335818070066

Cited by 22 publications

(22 citation statements)

References 6 publications

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“…Trickles tear off gas hollows from the cavity, crush them into smaller ones and randomly transport into the fluid bulk. The decay of the flow into thin trickles in the contact region of the immersed drop with the target fluid was visualized in [8], the evolution of the banded and mesh structures was traced in [9].…”

Section: The Discussion Of Resultsmentioning

confidence: 99%

“…The experimental technique and data processing were developed taking into account the requirements for recording fine details of the flow pattern (up to 12 μm) and resolution of short-lived components up to milliseconds. More detail description of the experimental facility and signals processing is presented in [7,8].…”

Section: Technique Of Experimentsmentioning

confidence: 99%

“…Systems of intensive oscillations of free-falling drops and propagating capillary waves on their surfaces [7], the formation of a discrete pattern of a dye drop substance at the cavern and crown surface [8] have been documented by high-resolution video cameras. With time, the discrete surface pattern of dye colored drop fluid distribution was transformed into systems of filament loops inside the target fluid [9].…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics, Energetics and Acoustics of Free Falling Drop Impact at a Motionless Fluid

Chashechkin¹,

Prokhorov²

2020

Topical Problems of Fluid Mechanics 2020

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The results of coordinated studies of the flow structure and acoustic signals generated in a fluid at rest by a freely falling drop of clean or dye colored water are presented. Highresolution video recording of the flow revealed the structure of plane ejecta, spikes, droplets sprays cavity, splash, secondary cavity, streamer, secondary droplets and sequence of capillary waves. Recurrence of the fine structure as the appearance of fast fine spikes after decay of initial perturbations on the free surface was observed in the center of the cavity and at the head of a growing splash. Groups of capillary waves accompanied the formation and elimination of every structure componentsplash, separating drop and coming back. A measuring hydrophone and a sensitive microphone measured acoustic signals consisting of a high-frequency pulse of the primary contact and a delayed lower-frequency packet(s). The relative poverty of the acoustic signal indicates that from a large number of observed gas bubbles only one, the formation of which included the break of a thin air bridge, was actually sounding. The shock of a fast-moving remnant of the bridge generates volumetric oscillations of the bubble. The sound stops as soon as the bubble adopts a smooth elliptical or spherical shape. The formation of fine flow components is governed by the release of available potential energy in the process of the elimination of the free surface during the merging of liquids. Perturbations that arose are saved in a thin "double layer" around the former boundary surface inside fluid which is deformed and transported by the main flow.

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Section: The Discussion Of Resultsmentioning

confidence: 99%

Section: Technique Of Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics, Energetics and Acoustics of Free Falling Drop Impact at a Motionless Fluid

Chashechkin¹,

Prokhorov²

2020

Topical Problems of Fluid Mechanics 2020

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“…At the same time, the bottom part of the drop remains unperturbed. The substance of the drop is non-uniformly distributed over the surface of the targeted fluid and forms a linear structure on the surface of the crown and a grid at the bottom of the cavity [14]. The goal of further part of this work is to calculate small surface oscillations of a deformed droplet with shape being significantly different from the spherical one.…”

Section: Oscillations Of a Detached Dropmentioning

confidence: 99%

Oscillations and Short Waves on a Free Falling Drop Surface (Experiment and Theory)

Chashechkin¹

2019

Topical Problems of Fluid Mechanics 2019

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Synchronous macrophotography and high-speed video filming data were used to investigate pinch-off, oscillations and short capillary surface waves of a free falling droplet. Planning of the experiment was carried out taking into account a free surface energy resulted from anisotropy of atomic-molecular interactions in a thin subsurface layer with a thickness of the order of the molecular cluster size (10-6 cm). During a drop pinch-off, fast process of the free surface energy release leads to formation of large-amplitude oscillations and short capillary waves. Theoretical model of droplet oscillations based on the Euler equations was developed.

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“…The drop matter is captured by the ring vortex encircling the cavity and partly remains on the liquid surface [9,10]. The falling drop is spread uniformly or generates banded structures of fast conversion of the available potential surface energy [10].…”

mentioning

confidence: 99%

The Delay in Cavity Formation in the Intrusive Mode of Coalescence of a Freely Falling Drop with a Target Liquid

Chashechkin

Ilinykh

2021

Dokl. Phys.

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The dynamics of a cavity formed in the intrusive mode of coalescence of a freely falling drop flowing smoothly into a liquid have been traced for the first time by the methods of photo and video registration. The cavity begins to form when the bottom part of the drop submerges, when the fluid coalescence line contracts to the center of the flow, and, simultaneously with the annihilation of the drop surface, the surface of the target liquid is restored. In this case, the orientation of ligaments (thin trickles), formed in the vicinity of the contact line changes. At the initial phase, they are directed outward and distribute the transmitted momentum and energy of the drop over the entire surface of the intrusion. Retraction of the coalescence line holds the transmitted energy and momentum of the drop in the contact patch. If the kinetic energy of the falling drop noticeably exceeds the potential surface energy, the cavity begins to form at the initial contact of the fluids and deepens in the course of the entire coalescence process, capturing the drop matter.

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Banded Structures in the Distribution Pattern of a Drop over the Surface of the Target Fluid

Cited by 22 publications

References 6 publications

Hydrodynamics, Energetics and Acoustics of Free Falling Drop Impact at a Motionless Fluid

Hydrodynamics, Energetics and Acoustics of Free Falling Drop Impact at a Motionless Fluid

Oscillations and Short Waves on a Free Falling Drop Surface (Experiment and Theory)

The Delay in Cavity Formation in the Intrusive Mode of Coalescence of a Freely Falling Drop with a Target Liquid

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