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The dynamics of a low-viscosity fluid layer inside a rotating cylinder under transverse translational vibration relative to the rotation axis is investigated experimentally. A novel vibrational effect, the generation of intense azimuthal fluid flows with velocities comparable with the cavity rotation velocity, is revealed. The structure and intensity of the vibrational flows and the flow transformation with variation of the determining dimensionless parameters (frequency and vibrational acceleration) are studied.

Sand liquefaction has been generated by horizontal vibration of a sand-liquid mixture. The pattern formation of the sand-liquid interface was found at large vibration intensity. The vibro-convective nature of this relief generation is proved. We demonstrate that the only controlling parameter is W = (bΩ) 2 /gD (radian frequency Ω, amplitude b, cell diameter D, gravity g). An analogy is made with the vibro-convective relief generation of the interface between two immiscible liquids in a closed cell submitted to high-frequency horizontal vibration. Hence, most of the results are similar to those obtained with a liquid-liquid interface as shown in this paper; nevertheless we emphasize some peculiarities of sand behavior.

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