Transformation of the bridge during drop separation

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

doi:10.1134/s0021894416030032

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…In the experiments, after adjusting the equipment, a drop formed on the capillary tip, pinched off under the action of its own weight with the formation of a satellite [97], and then fell freely on the target fluid. Flying through the photodetector, the drop triggered the recording equipment.…”

Section: Methodsmentioning

confidence: 99%

“…At the same time, a bridge is detached from the mother fluid, which is formed during the detachment of a drop, which, after a series of oscillations [97], contracts into a The outer diameter of the dyed area is d s i = 6.24 mm and the width of the quiet zone is ∆r λ = 1.6 mm (the leading edge advance velocity is u = d(∆r λ )/dt = 28 cm/s). The minimum phase velocity of capillary wave propagation is c min ph = 23.2 cm/s for waves with length λ c = 1.74 cm, the minimum group velocity is c min g = 17.7 cm/s for λ c = 4.4 cm.…”

Section: Flow Pattern Evolution In the Intrusive Mode Of Drop Coalesc...mentioning

confidence: 99%

“…At the same time, a bridge is detached from the mother fluid, which is formed during the detachment of a drop, which, after a series of oscillations [97], contracts into a spherical satellite d sa = 0.84 mm in diameter, which begins free fall. At t = 11.5 ms, the drop residual almost completely merges with a deepening cavity d d = 7 mm in diameter.…”

Section: Flow Pattern Evolution In the Intrusive Mode Of Drop Coalesc...mentioning

confidence: 99%

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

Chashechkin

Ilinykh

2023

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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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Section: Methodsmentioning

confidence: 99%

Section: Flow Pattern Evolution In the Intrusive Mode Of Drop Coalesc...mentioning

confidence: 99%

Section: Flow Pattern Evolution In the Intrusive Mode Of Drop Coalesc...mentioning

confidence: 99%

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

Chashechkin

Ilinykh

2023

Axioms

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“…The natural length scale (droplet diameter D) coexists with the others scales defined by the gravity field acceleration g and the medium physical quantities, such as the coefficient of specific surface tension = / , [cm 3 /s 2 ]. Thus, the capillary-gravitational scale, which was found in the dispersion equation of short waves on the fluid surface, is δ g γ =(γ/g) 1/2 [4,8], and the viscous-capillary scale is…”

Section: Energy Transformation During Droplet Pinch-off and Free Fallingmentioning

confidence: 99%

“…The calculations show that values of the linear scales vary in a wide range. The upper limit of the linear scales (δ g γ ~ 2.8 mm for water) is typical for mechanical processes and indicates the boundary between gravity and capillary branches of wave system [4,8]. Due to the relatively small size of studied drops D ~ δ g γ , the gravity field impact on the drop oscillations can be omitted.…”

Section: Energy Transformation During Droplet Pinch-off and Free Fallingmentioning

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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Hydrodynamics of detachment, free falling and impact of drops

Chashechkin

2021

J. Phys.: Conf. Ser.

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The results of optical measurements of drop dynamics are presented. Oscillations and waves on its surface were traced. The pattern of the secondary droplets falls onto an immersed drop and the discrete distribution of the substance of a uniformly colored drop in the targeted liquid was visualized. The important role of energy transport processes, both fast – local atomic-molecular – and slow that are translational and dissipative, in the formation of flow patterns is highlighted. A system of fundamental equations of fluid mechanics with equations of state for the Gibbs potential and density is applied. Ligaments – thin trickles with scales from atomic-molecular and macroscopic sizes – are investigated. Their images in the family of intrinsic solutions of the fundamental system and drop impact phenomena are shown.

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Transformation of the bridge during drop separation

Cited by 7 publications

References 8 publications

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

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

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

Hydrodynamics of detachment, free falling and impact of drops

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