Experimental verification of theoretical equations for acoustic radiation force on compressible spherical particles in traveling waves

Kennita A. Johnson, Hannah R. Vormohr, Alexander A. Doinikov, Ayache Bouakaz, C. Wyatt Shields, IV, Gabriel P. López, and Paul A. Dayton
Phys. Rev. E 93, 053109 – Published 17 May 2016

Abstract

Acoustophoresis uses acoustic radiation force to remotely manipulate particles suspended in a host fluid for many scientific, technological, and medical applications, such as acoustic levitation, acoustic coagulation, contrast ultrasound imaging, ultrasound-assisted drug delivery, etc. To estimate the magnitude of acoustic radiation forces, equations derived for an inviscid host fluid are commonly used. However, there are theoretical predictions that, in the case of a traveling wave, viscous effects can dramatically change the magnitude of acoustic radiation forces, which make the equations obtained for an inviscid host fluid invalid for proper estimation of acoustic radiation forces. To date, experimental verification of these predictions has not been published. Experimental measurements of viscous effects on acoustic radiation forces in a traveling wave were conducted using a confocal optical and acoustic system and values were compared with available theories. Our results show that, even in a low-viscosity fluid such as water, the magnitude of acoustic radiation forces is increased manyfold by viscous effects in comparison with what follows from the equations derived for an inviscid fluid.

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  • Received 20 January 2015
  • Revised 28 January 2016

DOI:https://doi.org/10.1103/PhysRevE.93.053109

©2016 American Physical Society

Physics Subject Headings (PhySH)

General Physics

Authors & Affiliations

Kennita A. Johnson1,2,*, Hannah R. Vormohr3, Alexander A. Doinikov4, Ayache Bouakaz4, C. Wyatt Shields, IV2,5, Gabriel P. López2,5,6, and Paul A. Dayton1

  • 1Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
  • 2NSF Research Triangle Materials Research Science and Engineering Center, Durham, North Carolina 27708, USA
  • 3Departments of Chemistry and Biology, University of Indianapolis, Indianapolis, Indiana 46227, USA
  • 4INSERM U930, Université François Rabelais, 37032 Tours, France
  • 5Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, USA
  • 6Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA

  • *kennita@email.unc.edu

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Issue

Vol. 93, Iss. 5 — May 2016

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