Rotary flow of a fluid

A study of the behavior of a viscoelastic fluid in which several deformation waves at a common frequency are excited is reported. The parameters for the onset of a synchronous rotation of a fluid are given and explained by the mechanism of rotary flow, which is discussed. The proposed mechanism for rotary flow was tested by experiments in which the order of radiation phases was altered. An apparatus to generate a field of gravity waves whose constant-phase surfaces are rotating spirals was used. The results show that the rotary flow of the fluid is due to the onset in a bounded volume of a synchronized rotation of the particles of the viscoelastic medium in the aggregate, with a spiral constant-phase surface of the field in the radiation plane. This rotation is caused by the imposition of monochromatic deformation waves of a common frequency in the medium.