Instability of particle inertial migration in shear flow

Asmolov ES, Nizkaya TV, Harting J, Vinogradova OI (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Physics of Fluids American Institute of Physics (AIP)

Book Volume: 33

Article Number: 092008

Journal Issue: 9

DOI: 10.1063/5.0063566

Abstract

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.

Authors with CRIS profile

Jens Harting Professur für Multiskalen-Modellierung für kontrollierte Filmbildung (HIERN)

Related research project(s)

Modelling transport of nanoparticles (SFB 1411 - D02) Design of particulate products (SFB 1411) Jan. 1, 2020 - Dec. 31, 2023

Involved external institutions

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry (RAS) / Институт физической химиии и электрохимии им. А.Н. Фрумкина RU Russian Federation (RU)

How to cite

APA:

Asmolov, E.S., Nizkaya, T.V., Harting, J., & Vinogradova, O.I. (2021). Instability of particle inertial migration in shear flow. Physics of Fluids, 33(9). https://dx.doi.org/10.1063/5.0063566

MLA:

Asmolov, Evgeny S., et al. "Instability of particle inertial migration in shear flow." Physics of Fluids 33.9 (2021).

BibTeX: Download