Multiple Emissions of Splashes upon Drop Impact

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

doi:10.1134/s1028335820100067

Cited by 18 publications

(19 citation statements)

References 10 publications

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“…The experiments were setup in a laboratory that is part of the GFK facility operated in IPMech RAS. This facility has been used before to perform numerous high-resolution tests on water-water and water-oil interactions under isothermal conditions [13,14], including studies on the material redistribution of the droplet and receiving (target) liquid [16,17], as well as on the acoustic effects and high-speed streamers that develop due to the droplet impact [25]. In the current work, the facility was modified so that it was able to handle hightemperature materials.…”

Section: Methodsmentioning

confidence: 99%

“…The total coalescence, rebound and fast partial bounce regimes of free-falling droplet interaction with the receiving liquid were studied experimentally in [13]. For high impact velocities, numerous fine droplets (spray) are formed including multiple splashes [14]. Experiments have also shown that sometimes a large bubble becomes entrapped when the crown closes at the top [10,12].…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that complex net-like patterns tend to develop on the cavity surface; also, the material distribution in the central jet was shown to be highly non-uniform. Note that most of the studies were performed in isothermal conditions, with various miscible and immiscible liquids: water-water and water-oil pairs [7][8][9][10][11][12][13][14][15][16][17], liquid metal [18,19], and a distilled water, silicone oil and glycerine-water mixture [20], so that the densities of the impacting and receiving liquids were either identical, or did not differ substantially.…”

Section: Introductionmentioning

confidence: 99%

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The Splashing of Melt upon the Impact of Water Droplets and Jets

et al. 2021

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Small-scale experimental studies of melt splashing upon the impact of water are presented here, with a focus on the fluid dynamics and thermal aspects of these interactions. Gravity-accelerated droplets and forced short-duration water jets interacted with liquid Rose’s alloy superheated to 100–200 degrees above its melting point. A repeatability study was performed for better-control of the gravity fall of a droplet. The amount of perturbation on the melt surface was obtained from a video recording, and indicated the existence of three principal stages of interaction. The cases using the forced water jet demonstrated the occurrence of a cumulative jet of melt following the collapse of the cavity caused by the water impact. Also, it was shown that numerous small-diameter melt droplets were scattered by the primary impulse, and small-scale micro-eruptions were observed, which generated small but fast melt droplets at the later stages of interaction.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Splashing of Melt upon the Impact of Water Droplets and Jets

et al. 2021

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“…The main features in the flow pattern at relatively high drop contact velocities are the ejection of small droplets from the tops of the spikes forming sprays [99] and the cavity formation from the moment of primary contact. Simultaneously, the continuum drop splits into thin jets on the contact line of the merging fluids [78], which leave wakes forming colored fibers in the target fluid [79].…”

Section: Evolution Of the Drop Materials Distribution Pattern In The ...mentioning

confidence: 99%

Intrusive and Impact Modes of a Falling Drop Coalescence with a Target Fluid at Rest

Chashechkin

Ilinykh

2023

Axioms

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The evolution of the falling drop substance transfer in a target fluid at rest was traced by high-speed video techniques. Two flow modes were studied: slow intrusive flow, when the KE of the drop was comparable or less than the available potential energy (APSE), and a fast impact flow, at a relatively high drop contact velocity. For the substance transfer visualization, a drop of alizarin ink solution at various concentrations was used. The use of transparent partially colored fluid allows tracing the drop matter motion in the bulk and on the fluid free surface. The traditional side and frontal view of flow patterns were registered and analyzed. In both flow modes, the substance of the drop partially remained on the free surface and partially went into the target fluid bulk, where it was distributed non-uniformly. In the intrusive mode, the drop substance partially remained on the surface, while the main mass of the drop flowed into the thickness of the target fluid, forming the lenticular colored domain. The intrusion was gradually transformed into an annular vortex. In the impact mode, the drop broke up into individual fibers during the coalescence, creating linear and reticular structures on the surface of the cavity and the crown. The flow patterns composed of individual fibers were rapidly rebuilt as the flow evolved and the splash emerged and decayed. The sizes of cavities and colored fluid domains were compared in different flow regimes as well. The total energy transfer and transformation impact on the flow structure formation and dynamics was revealed.

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“…Multifrequency lightning in the optical and X-ray band [3] showed the initial multilayered structure of the thin ejecta sheet [4] coalescing into the crown. From the vertices of spikes at the teeth of the eject sheet, groups of small droplets emerge cyclically [5]. The drop contact is accompanied by generation of a high-frequency sound packets [2,6].…”

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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Multiple Emissions of Splashes upon Drop Impact

Cited by 18 publications

References 10 publications

The Splashing of Melt upon the Impact of Water Droplets and Jets

The Splashing of Melt upon the Impact of Water Droplets and Jets

Intrusive and Impact Modes of a Falling Drop Coalescence with a Target Fluid at Rest

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

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