Acoustic Force Density Acting on Inhomogeneous Fluids in Acoustic Fields

Jonas Tobias Karlsen, Per Augustsson, Henrik Bruus

Research output: Contribution to journalJournal articleResearchpeer-review

509 Downloads (Pure)


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
Issue number11
Pages (from-to)114504
Number of pages6
Publication statusPublished - 2016


Dive into the research topics of 'Acoustic Force Density Acting on Inhomogeneous Fluids in Acoustic Fields'. Together they form a unique fingerprint.

Cite this