This title appears in the Scientific Report :
2021
Please use the identifier:
http://hdl.handle.net/2128/29292 in citations.
Please use the identifier: http://dx.doi.org/10.1063/5.0063566 in citations.
Instability of particle inertial migration in shear flow
Instability of particle inertial migration in shear flow
In a shear flow, particles migrate to their equilibrium positions in the microchannel. Here, we demonstrate theoretically that if particles areinertial, this equilibrium can become unstable due to the Saffman lift force. We derive an expression for the critical Stokes number thatdetermines the onset...
Saved in:
Personal Name(s): | Asmolov, Evgeny S. |
---|---|
Nizkaya, Tatiana V. / Harting, Jens / Vinogradova, Olga I. (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien; IEK-11 |
Published in: | Physics of fluids, 33 (2021) 9, S. 092008 - |
Imprint: |
[S.l.]
American Institute of Physics
2021
|
DOI: |
10.1063/5.0063566 |
Document Type: |
Journal Article |
Research Program: |
Migration und Dynamik von Teilchen in komplexen Geometrien und Strömungen Simulations, Theory, Optics, and Analytics (STOA) |
Link: |
Published on 2021-09-24. Available in OpenAccess from 2022-09-24. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/5.0063566 in citations.
In a shear flow, particles migrate to their equilibrium positions in the microchannel. Here, we demonstrate theoretically that if particles areinertial, this equilibrium can become unstable due to the Saffman lift force. We derive an expression for the critical Stokes number thatdetermines the onset of instable equilibrium. We also present results of lattice Boltzmann simulations for spherical particles and prolatespheroids to validate the analysis. Our work provides a simple explanation of several unusual phenomena observed in earlier experimentsand computer simulations, but never interpreted before in terms of the unstable equilibrium. |