Dynamics of Two-liquid System at Rotation and Vibration with Equal Frequencies

Karpunin, Ivan; Kozlov, Nikolai

doi:10.1007/s12217-020-09824-w

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…An example is an averaged inertial fields excited by circular or translational vibrations of the axis of rotation of the cavity in the transverse direction with the frequency of rotation of the cavity. The appearance of an averaged force field was previously detected in [6] and studied in the problem of vibrational dynamics in rotating cavities of various multiphase systems [7]. It should be noted that in the cases described, the cavity performed a uniform rotation.…”

Section: Discussion Of the Resultsmentioning

confidence: 63%

Liquid free boundary in vertical gap subject to modulated rotation

Козлов

Petukhova

2022

J. Phys.: Conf. Ser.

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The effect of rotation velocity modulation on the equilibrium shape of the liquid-air interface in a vertical slot gap rotating around a horizontal axis is studied experimentally. The case is considered when the modulation frequency coincides with the rotation frequency. It is found that in this case, velocity modulation leads to a violation of the axial symmetry of the interface formed by the centrifugal force of inertia. The displacement of the center of symmetry of the interface increases linearly with the amplitude of the velocity modulation and decreases quadratically with the speed of rotation. It is shown that the detected phenomenon is explained by the averaged effect of an external gravitational field on a fluid in a rotating frame of reference.

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Section: Discussion Of the Resultsmentioning

confidence: 63%

Liquid free boundary in vertical gap subject to modulated rotation

Козлов

Petukhova

2022

J. Phys.: Conf. Ser.

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“…This field decisively affects, for example, thermal convection: pendulum thermal vibrational convection (synchronized rotational and translational cavity vibrations) [18,19], vibrational convection in rotating cavities under the action of synchronized translational vibrations perpendicular to the rotation axis [20]. The effect of an average force field generation discovered in [20] was studied in the problem of vibrational dynamics of multi-phase systems in rotating cavities [21]. Note that in the described cases, the cavities performed a uniform rotation.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of liquids with high viscosity contrast in unevenly rotating Hele-Shaw cell

Козлов

Petukhova

Kozlov

2023

Phil. Trans. R. Soc. A.

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The paper is devoted to the experimental study of the dynamics of an interface between two liquids with high viscosity contrast filling a vertical, circular narrow gap rotating about a horizontal axis at a speed modulated by librations. The equilibrium shape and stability of the interphase boundary are considered. In the absence of librations, under the action of the centrifugal force the boundary has an axisymmetric shape. At librations, at certain frequency ratios, the interface loses its axisymmetric position: in the cavity reference frame, it is displaced in the radial direction. It is theoretically shown that the discovered phenomenon is explained by the average action of gravity; the results of experiments and theory are consistent. The experiments reveal that with an increase in the modulation amplitude the circular interface loses stability in a threshold manner: an azimuthally periodic relief, quasi-stationary in the cavity frame, emerges. This is associated with the Kelvin–Helmholtz instability due to tangential oscillations of the less viscous liquid near the interface. A dimensionless parameter that determines the stability of the interface is obtained in the limit of high dimensionless libration frequency. The stability threshold increases with the decrease in the dimensionless frequency. This article is part of the theme issue 'New trends in pattern formation and nonlinear dynamics of extended systems'.

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Experimental Study of Enhanced Boiling Heat Transfer with Suction

Liu

et al. 2021

Microgravity Sci. Technol.

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Dynamics of Two-liquid System at Rotation and Vibration with Equal Frequencies

Cited by 5 publications

References 16 publications

Liquid free boundary in vertical gap subject to modulated rotation

Liquid free boundary in vertical gap subject to modulated rotation

Dynamics of liquids with high viscosity contrast in unevenly rotating Hele-Shaw cell

Experimental Study of Enhanced Boiling Heat Transfer with Suction

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