Symmetry breaking phenomena in thermovibrationally driven particle accumulation structures

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Lappa, Marcello and Burel, Thomas (2020) Symmetry breaking phenomena in thermovibrationally driven particle accumulation structures. Physics of Fluids, 32 (5). 053314. ISSN 1070-6631 (https://doi.org/10.1063/5.0007472)

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Abstract

Following the recent discovery of new three-dimensional particle attractors driven by joint (fluid) thermovibrational and (particle) inertial effects in closed cavities with various shapes and symmetries [M. Lappa, Phys. Fluids 26(9), 093301 (2014); ibid. 31(7), 073303 (2019)], the present analysis continues this line of inquiry by probing influential factors hitherto not considered; among them, the role of the steady component of thermovibrational convection, i.e., the time-averaged velocity field that is developed by the fluid due to the non-linear nature of the overarching balance equations. It is shown how this apparently innocuous problem opens up a vast parameter space, which includes several variables, comprising (but not limited to) the frequency of vibrations, the so-called "Gershuni number,"the size of particles (Stokes number), and their relative density with respect to the surrounding fluid (density ratio). A variety of new particle structures (2D and 3D) are uncovered and a complete analysis of their morphology is presented. The results reveal an increase in the multiplicity of solutions brought in by the counter-intuitive triadic relationship among particle inertial effects and the instantaneous and time-averaged convective thermovibrational phenomena. Finally, a universal formula is provided that is able to predict correctly the time required for the formation of all the observed structures.

ORCID iDs

Lappa, Marcello ORCID logoORCID: https://orcid.org/0000-0002-0835-3420 and Burel, Thomas ORCID logoORCID: https://orcid.org/0000-0002-2791-4086;
CORE (COnnecting REpositories)