Abstract
The effect of the radiation force on a spherical drop of an ideal liquid in the vicinity of the free boundary of the liquid when an acoustic wave is normally incident on the liquid surface is studied. As a result, the liquid sphere is located in the field of standing acoustic wave of pressure with the node at the free liquid surface. The measure of interaction is the radiation force: the time-average integral over the pressure in the external fluid caused by the acoustic wave over the surface of the sphere. The approach assuming the use of the velocity field potential obtained by solving the linear diffraction problem when determining the pressure in the liquid is used. It is established that there are frequencies of the incident wave at which the radiation force does not act on the spherical drops, which, therefore, will be stationary.
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