Instability of particle inertial migration in shear flow
Autor: | Olga I. Vinogradova, Jens Harting, Tatiana V. Nizkaya, Evgeny S. Asmolov |
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Přispěvatelé: | Applied Physics and Science Education |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Fluid Flow and Transfer Processes
Physics Work (thermodynamics) Microchannel Inertial frame of reference Mechanical Engineering Fluid Dynamics (physics.flu-dyn) Computational Mechanics Lattice Boltzmann methods FOS: Physical sciences Mechanics Physics - Fluid Dynamics Condensed Matter - Soft Condensed Matter Condensed Matter Physics Instability Physics::Fluid Dynamics Mechanics of Materials Soft Condensed Matter (cond-mat.soft) Particle ddc:530 Shear flow Stokes number |
Zdroj: | Physics of Fluids, 33(9):092008. American Institute of Physics Physics of fluids 33(9), 092008-(2021). doi:10.1063/5.0063566 |
ISSN: | 1070-6631 |
Popis: | In a shear flow particles migrate to their equilibrium positions in the microchannel. Here we demonstrate theoretically that if particles are inertial, this equilibrium can become unstable due to the Saffman lift force. We derive an expression for the critical Stokes number that determines the onset of instable equilibrium. We also present results of lattice Boltzmann simulations for spherical particles and prolate spheroids to validate the analysis. Our work provides a simple explanation of several unusual phenomena observed in earlier experiments and computer simulations, but never interpreted before in terms of the unstable equilibrium. 9 pages, 8 figures |
Databáze: | OpenAIRE |
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