title: Observation of orbital angular momentum transfer from bessel-shaped acoustic vortices to diphasic liquid-microparticle mixtures.
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.
authors.affiliation: Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China.|Department of Mechanical Engineering, University Walk, University of Bristol, Bristol BS8 1TR, United Kingdom.
authors.forename: ZhenYu
authors.initials: Z
authors.lastname: Hong
authors.affiliation: Department of Mechanical Engineering, University Walk, University of Bristol, Bristol BS8 1TR, United Kingdom.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Mechanical Engineering, University Walk, University of Bristol, Bristol BS8 1TR, United Kingdom.
authors.forename: Bruce W
authors.initials: BW
authors.lastname: Drinkwater