The Geometry of Sand Ripples in a Uniformly Rotating and Librating Horizontal Cylinder

Polezhaev, Denis

doi:10.1007/s12217-020-09810-2

Microgravity Sci. Technol.

2020

DOI: 10.1007/s12217-020-09810-2

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The Geometry of Sand Ripples in a Uniformly Rotating and Librating Horizontal Cylinder

Denis Polezhaev

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Cited by 2 publications

References 25 publications

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Dynamics of two liquids in a non-uniformly rotating horizontal cylinder

Zimasova

Козлов

2023

E3S Web of Conf.

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Controlling the shape of the interfacial boundary is an important technological task. The effect of rotation velocity modulation on the interface between light viscous and denser low viscosity fluid in a rotating horizontal cylinder is studied experimentally. Liquids are characterized by a high contrast of viscosities, these are glycerin and a low-viscosity (denser) fluorinert FC-40. Glycerin is stained with rhodamine, which makes it possible to study the shape of the interface by photo registration with high accuracy when illuminating liquids with a green laser, which causes rhodamine fluorescence. Experiments are carried out in the centrifuged state of liquids when the gravity field has no effect while varying the rotation speed, as well as the amplitude and frequency of librations. It is found that librations qualitatively change the shape of the interface near the ends of the cavity without affecting the cylindrical interface in the middle cavity part. It is shown that this is due to different "viscous" interactions of liquids with the ends of the oscillating cavity, as a result of which the interface near the ends performs radial oscillations with a frequency of librations, and the latter leads to an averaged radial displacement of the wetting boundary of the ends, which increases with the modulation amplitude. At certain amplitudes, the contact line reaches the outer boundary of the cavity. It is shown that the dynamic equilibrium of the interface between liquids of different densities is determined by the averaged interaction of liquids of different viscosity with the oscillating ends.

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Dynamics of two liquids in a non-uniformly rotating horizontal cylinder

Zimasova

Козлов

2023

E3S Web of Conf.

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Pattern formation on the surface of the granular medium in a horizontal rotating cylinder filled with fluid

Dyakova

Polezhaev

2022

Phys. Rev. Fluids

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The Geometry of Sand Ripples in a Uniformly Rotating and Librating Horizontal Cylinder

Cited by 2 publications

References 25 publications

Dynamics of two liquids in a non-uniformly rotating horizontal cylinder

Dynamics of two liquids in a non-uniformly rotating horizontal cylinder

Pattern formation on the surface of the granular medium in a horizontal rotating cylinder filled with fluid

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