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

ZhenYu Hong, Jie Zhang, Bruce W. Drinkwater
2015 Physical Review Letters  
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 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 non-homogeneous. Here OAM transfer to the
more » ... sfer to the microparticle clusters dominates and they spin at high speeds entraining the surrounding fluid.
doi:10.1103/physrevlett.114.214301 pmid:26066437 fatcat:gpjlj3dclvbkxnzf3oa43nw4ce