Inertial migration of oblate spheroids in a plane channel
| Autor: | Jens Harting, Anna S. Gekova, Olga I. Vinogradova, Evgeny S. Asmolov, Tatiana V. Nizkaya |
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| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Lift coefficient Plane (geometry) Mechanical Engineering Computational Mechanics Lattice Boltzmann methods Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Laminar flow Mechanics Radius Physics - Fluid Dynamics Vorticity Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Mechanics of Materials 0103 physical sciences ddc:530 Astrophysics::Earth and Planetary Astrophysics 010306 general physics Pressure gradient Dimensionless quantity |
| Zdroj: | Physics of Fluids, 32(11):0028353. American Institute of Physics Physics of fluids 32(11), 7 (2020). doi:10.1063/5.0028353 |
| ISSN: | 1070-6631 |
| DOI: | 10.48550/arxiv.2009.02124 |
| Popis: | We discuss an inertial migration of oblate spheroids in a plane channel, where steady laminar flow is generated by a pressure gradient. Our lattice Boltzmann simulations show that spheroids orient in the flow, so that their minor axis coincides with the vorticity direction (a log-rolling motion). Interestingly, for spheroids of moderate aspect ratios, the equilibrium positions relative to the channel walls depend only on their equatorial radius $a$. By analysing the inertial lift force we argue that this force is proportional to $a^3b$, where $b$ is the polar radius, and conclude that the dimensionless lift coefficient of the oblate spheroid does not depend on $b$, and is equal to that of the sphere of radius $a$. Comment: 7 pages, 8 figures |
| Databáze: | OpenAIRE |
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