Acoustic Force Density Acting on Inhomogeneous Fluids in Acoustic Fields

Jonas Tobias Karlsen, Per Augustsson, Henrik Bruus

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Abstract

We present a theory for the acoustic force density acting on inhomogeneous fluids in acoustic fields on time scales that are slow compared to the acoustic oscillation period. The acoustic force density depends on gradients in the density and compressibility of the fluid. For microfluidic systems, the theory predicts a relocation of the inhomogeneities into stable field-dependent configurations, which are qualitatively different from the horizontally layered configurations due to gravity. Experimental validation is obtained by confocal imaging of aqueous solutions in a glass-silicon microchip.
Original languageEnglish
JournalPhysical Review Letters
Volume117
Issue number11
Pages (from-to)114504
Number of pages6
ISSN0031-9007
DOIs
Publication statusPublished - 2016

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