Forces acting on a small particle in an acoustical field in a viscous fluid

Mikkel Settnes, Henrik Bruus

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We calculate the acoustic radiation force from an ultrasound wave on a compressible, spherical particle suspended in a viscous fluid. Using Prandtl-Schlichting boundary-layer theory, we include the kinematic viscosity of the solvent and derive an analytical expression for the resulting radiation force, which is valid for any particle radius and boundary-layer thickness provided that both of these length scales are much smaller than the wavelength of the ultrasound wave (millimeters in water at megahertz frequencies). The acoustophoretic response of suspended microparticles is predicted and analyzed using parameter values typically employed in microchannel acoustophoresis.
    Original languageEnglish
    JournalPhysical Review E
    Volume85
    Issue number1
    Pages (from-to)016327
    ISSN2470-0045
    DOIs
    Publication statusPublished - 2012

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