Inertial focusing of finite-size particles in microchannels

Evgeny S. Asmolov, Alexander L. Dubov, Tatiana V. Nizkaya, Jens Harting, Olga I. Vinogradova

    Research output: Contribution to journalArticleAcademicpeer-review

    9 Citations (Scopus)
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    Abstract

    At finite Reynolds numbers, Re, particles migrate across laminar flow streamlines to their equilibrium positions in microchannels. This migration is attributed to a lift force, and the balance between this lift and gravity determines the location of particles in channels. Here we demonstrate that velocity of finite-size particles located near a channel wall differs significantly from that of an undisturbed flow, and that their equilibrium position depends on this, referred to as slip velocity, difference. We then present theoretical arguments, which allow us to generalize expressions for a lift force, originally suggested for some limiting cases and Re ≤ 1, to finite-size particles in a channel flow at Re ≤ 20. Our theoretical model, validated by lattice Boltzmann simulations, provides considerable insight into inertial migration of finite-size particles in a microchannel and suggests some novel microfluidic approaches to separate them by size or density at a moderate Re.

    Original languageEnglish
    Pages (from-to)613-630
    Number of pages18
    JournalJournal of Fluid Mechanics
    Volume840
    DOIs
    Publication statusPublished - 10 Apr 2018

    Fingerprint

    microchannels
    Microchannels
    Particle size
    Channel flow
    Laminar flow
    Microfluidics
    Gravitation
    Reynolds number
    channel flow
    laminar flow
    slip
    gravitation
    simulation

    Keywords

    • microfluidics
    • particle/fluid flow
    • suspensions

    Cite this

    Asmolov, E. S., Dubov, A. L., Nizkaya, T. V., Harting, J., & Vinogradova, O. I. (2018). Inertial focusing of finite-size particles in microchannels. Journal of Fluid Mechanics, 840, 613-630. https://doi.org/10.1017/jfm.2018.95
    Asmolov, Evgeny S. ; Dubov, Alexander L. ; Nizkaya, Tatiana V. ; Harting, Jens ; Vinogradova, Olga I. / Inertial focusing of finite-size particles in microchannels. In: Journal of Fluid Mechanics. 2018 ; Vol. 840. pp. 613-630.
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    Asmolov, ES, Dubov, AL, Nizkaya, TV, Harting, J & Vinogradova, OI 2018, 'Inertial focusing of finite-size particles in microchannels', Journal of Fluid Mechanics, vol. 840, pp. 613-630. https://doi.org/10.1017/jfm.2018.95

    Inertial focusing of finite-size particles in microchannels. / Asmolov, Evgeny S.; Dubov, Alexander L.; Nizkaya, Tatiana V.; Harting, Jens; Vinogradova, Olga I.

    In: Journal of Fluid Mechanics, Vol. 840, 10.04.2018, p. 613-630.

    Research output: Contribution to journalArticleAcademicpeer-review

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    AU - Asmolov, Evgeny S.

    AU - Dubov, Alexander L.

    AU - Nizkaya, Tatiana V.

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    AU - Vinogradova, Olga I.

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