Drop-impact hydrodynamics: Short waves on a surface of the crown

Chashechkin, Yu. D.; Prokhorov, V. E.

doi:10.1134/s1028335813070021

Cited by 22 publications

(10 citation statements)

References 7 publications

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“…The second fine viscose component is specific internal and depends on the angle ϕ of a solid boundary slope to the horizon corresponding to terms containing k 2 ⊥ in Eq. (17). In limiting case of homogeneous fluid both singular solutions become identical, so the problem becomes degenerated and ill-posed [22].…”

Section: Classification Of Infinitesimal Components Of Periodic Flowsmentioning

confidence: 97%

Differential Fluid Mechanics—Harmonization of Analytical, Numerical and Laboratory Models of Flows

Chashechkin

2015

Computational Methods in Applied Sciences

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Concepts of a "solid body motion" and "fluid flow" are compared taking into account the condition of inobservability of a "fluid particle". General properties of the fundamental set of fluid mechanics equations, accepted for describing fluid flows, are analyzed taking into account the compatibility condition. Hierarchy of periodic flows is classified basing on the order of linearized set of governing equations. Results of theoretical analysis of infinitesimal periodic flows in a stably stratified fluid including periodic internal waves and accompanied family of small scale components are given. Calculations of periodic internal waves propagation and generation in a fluid with arbitrary stable profile of buoyancy are compared with data of schlieren observations in laboratory. Fine flow structure observed behind uniformly towing strip is discussed in context of a given model. Some conclusions and recommendations on improvement techniques of a fluid dynamics experiment are presented.

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Section: Classification Of Infinitesimal Components Of Periodic Flowsmentioning

confidence: 97%

Differential Fluid Mechanics—Harmonization of Analytical, Numerical and Laboratory Models of Flows

Chashechkin

2015

Computational Methods in Applied Sciences

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“…With the expansion of the crown, the diameter of which reaches c D  29.7 mm at t  26.2 ms, the capillary waves, which were studied in [21], cover both the inner and the outer sidewalls of the crown, while the bottom of the cavity remains smooth. The upper edge of the crown is partially smoothed out, only a few protrusions remain on it.…”

Section: Topical Problems Of Fluid Mechanics 3 ______________________mentioning

confidence: 99%

“…With time, the discrete surface pattern of dye colored drop fluid distribution was transformed into systems of filament loops inside the target fluid [9]. A packets structure of acoustic signals during the initial contact of the falling drop with the target liquid [10] as well as, groups of capillary waves on the crown [11] and on the surface of submerging drop [12] were analysed.…”

Section: Introductionmentioning

confidence: 99%

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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“…В них возбуждаются объемные колебания [2], поверхностные капиллярные волны [3], влияющие на рассеяние электромагнитных волн в широком диапазоне частот [4]. Динамическое состояние влияет на характер взаимодействия падающей капли с принимающей жидкостью, направленность и интенсивность процессов обмена веществами между атмосферой и гидросферой [5,6], излучение звука в водную и воздушную среду [7], генерацию капиллярных волн в окружающей жидкости [8], в венце с каверной [9] и даже на поверхности погружающейся капли [10].…”

unclassified

“…От верхней кромки венца к каверне начинает сбегать группа капиллярных волн, амплитуда которых растет по мере продвижения (рис. 1г, t = 10.9 мкс, картина волн на поверхности венца более детально изучена в [9]). В увеличенном изображении нижней части венца начинают прослеживаться окрашенные округлые выступы -оголовки растущих в окружающую жидкость тонких струек с вихревым оголовком -лигаментов [21,22].…”

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Evolution of the fine structure of the pattern of the distribution of a substance of the free-fall droplet in mixing liquids

Chashechkin¹

2019

Известия Российской академии наук. Физика атмосферы и океана

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The evolution of the pattern of the substance of a drop of ink falling freely into quiet water in the mode of formation of a cumulative back jet stream was traced by high-speed video recording. In the phase of primary contact and coalescence, the pigment of the drops merging with the targeted fluid is distributed in the form of fine fibers (ligaments), which form a regular striped pattern on the surface of the growing crown, and a net pattern consisting of three-, four- and pentagonal cells at the bottom of the cavity. The fibrous distributions of the substance droplets was saved at all subsequent stages of the evolution of the flow until the formation of a cascade of vortices, after which the picture is blurred by the processes of molecular diffusion in a practically quiescent liquid. The formation of a discrete (fibrous) pattern of the distribution of the substance of a drop is associated with the compactness of the region of release of the available potential surface energy during the confluence of liquids, which initiates a fast movement of a thin layer. Subsequent preservation of fibers ensures the slowness of molecular diffusion processes.

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Drop-impact hydrodynamics: Short waves on a surface of the crown

Cited by 22 publications

References 7 publications

Differential Fluid Mechanics—Harmonization of Analytical, Numerical and Laboratory Models of Flows

Differential Fluid Mechanics—Harmonization of Analytical, Numerical and Laboratory Models of Flows

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

Evolution of the fine structure of the pattern of the distribution of a substance of the free-fall droplet in mixing liquids

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