Acoustic Force Density Acting on Inhomogeneous Fluids in Acoustic Fields

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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.

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Authors
Organisations
External organisations
  • Technical University of Denmark
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences
Original languageEnglish
Pages (from-to)114504
Number of pages6
JournalPhysical Review Letters
Volume117
Issue number11
Publication statusPublished - 2016 Sep 9
Publication categoryResearch
Peer-reviewedYes

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