Instability of particle inertial migration in shear flow

Autor: Olga I. Vinogradova, Jens Harting, Tatiana V. Nizkaya, Evgeny S. Asmolov
Přispěvatelé: Applied Physics and Science Education
Jazyk: angličtina
Rok vydání: 2021
Předmět:
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