ACOUSTIC RADIATION FORCE ON A SMALL COMPRESSIBLE SPHERE IN A FOCUSED BEAM

A general expression for the acoustic radiation force on a small compressible sphere has been derived and expressed in terms of the time-averaged densities Tiand Viof kinetic and potential energies, respectively, in the incident sound field. The results have been applied to two focused beams: Gaussian beams and piston beams. For both cases, the analytical expressions of the radiation forces on a small compressible sphere placed on the axis of the beams are calculated. The pertinent applications in acoustic levitation and bubble dynamics are discussed. © 1990, Acoustical Society of America. All rights reserved.