Acoustic Rotational Manipulation Using Orbital Angular Momentum Transfer

被引:162
作者
Anhaeuser, Andreas
Wunenburger, Regis [1 ]
Brasselet, Etienne
机构
[1] Univ Bordeaux, LOMA, UMR 5798, F-33400 Talence, France
关键词
RADIATION TORQUE; GENERATION; ABSORPTION; ALIGNMENT;
D O I
10.1103/PhysRevLett.109.034301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on the first quantitative test of acoustic orbital angular momentum transfer to a sound absorbing object immersed in a viscous liquid. This is done by realizing an original experiment that is to spin a millimeter-size target disk using an ultrasonic vortex beam. We demonstrate the balance between the acoustic radiation torque calculated from the Brillouin stress tensor and the viscous torque evaluated from the steady state spinning frequency. Moreover, we unveil a rotational acoustic streaming phenomenon that results from the acoustic angular momentum transfer to the host fluid. We show that it lowers the viscous torque, thereby restoring the torque balance.
引用
收藏
页数:5
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