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A Numerical Investigation of the Vibration Effect on Interactions in a Gas Bubble Ensemble and Solid Particles in a Liquid

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Journal of Applied Mechanics and Technical Physics Aims and scope

Abstract—It is known that linearly polarized translational vibrations can multiply the capture cross section of deposited solid particles by a single gas bubble suspended in a liquid. This fact is of great theoretical and practical importance for using vibrations to intensify the flotation process, which, however, involves multiple rising bubbles. The present work studied the capture of solid particles by a gas bubble ensemble in liquid exposed to high-frequency small amplitude vibrations in two-dimensional formulation numerically. The numerical solution was obtained using ANSYS Fluent software. The obtained fields of the averaged and pulsating components of the flow velocity were then processed by our own code in order to calculate the trajectories of small particles from a “cloud” located in the computational domain. The description of forces acting on the particle took the added mass of the fluid, gravity, the Archimedean force, Stokes force, Basset force, and the vibrational force due to the inhomogeneity of the pulsating field into account. The calculations were performed for millimeter air bubbles in water with particle characteristics significant for the flotation process. The influence of vibrations is shown to be significantly attenuated within the bubble ensemble due to the “screening” effect, which peaks at the highest vibration frequency and depends weakly on the distance between the bubbles. However, vibrations of a lesser frequency, at which the gas in bubbles is compressible, are still able to penetrate deep into the liquid volume at a sufficient excitation intensity, and thereby increase the particle capture region.

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Funding

This work was supported by the Russian Foundation for Basic Research (project no. 17-41-590974-r_ural_a).

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Correspondence to V. V. Konovalov or T. P. Lyubimova.

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Translated by L. Trubitsyna

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Konovalov, V.V., Lyubimova, T.P. A Numerical Investigation of the Vibration Effect on Interactions in a Gas Bubble Ensemble and Solid Particles in a Liquid. J Appl Mech Tech Phy 61, 1080–1088 (2020). https://doi.org/10.1134/S0021894420070056

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  • DOI: https://doi.org/10.1134/S0021894420070056

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