Observation of Orbital Angular Momentum Transfer from Bessel-Shaped Acoustic Vortices to Diphasic Liquid-Microparticle Mixtures

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Abstract

We observe distinct regimes of orbital angular momentum (OAM) transfer from two-dimensional Bessel-shaped acoustic vortices to matter. In a homogeneous diphasic mixture of microparticles and water, slow swirling about the vortex axis is seen. This effect is driven by the absorption of OAM across the mixture, the motion following the OAM density distribution. Larger particles are formed into clusters by the acoustic radiation force, making the mixture nonhomogeneous. Here, the OAM transfer to the microparticle clusters dominates and they spin at high speeds entraining the surrounding fluid.
Original languageEnglish
Article number214301
Number of pages5
JournalPhysical Review Letters
Volume114
Issue number21
DOIs
Publication statusPublished - 28 May 2015

Bibliographical note

Date of Acceptance: 04/05/2015

Keywords

  • Orbital angular momentum
  • acoustic vortices
  • acoustic radiation force
  • rotational motion

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