Abstract
The force owing to radiation pressure on an object of any shape and having an arbitrary normal boundary impedance can be expressed in terms of the asymptotic scattering functions for the object [J. Acoust. Soc. Am. 23, 312 (1951)]. It will be shown that this specification of the radiation force is valid for any obstacle irrespective of whether it is possible to specify a normal boundary impedance. Two typical obstacles having nonlocal boundary conditions are a metal disk and a lossy bubble. A simple relation between the radiation pressure in a plane standing acoustic wave and the acoustic impedance will be given. Equations for the generation of acoustic streaming have been derived in terms of Brillouin's radiation stress tensor [J. Acoust. Soc. Am. 25, 60 (1953)]. It is emphasized that these equations are valid for any nonreacting fluid irrespective of the loss mechanisms involved. For the special case of a barotropic fluid, W. P. Raney has shown that these equations reduce to those obtained by Medwin and Rudnick [J. Acoust. Soc. Am. 25, 538 (1953)]. [This work has been supported jointly by the Office of Naval Research and the U. S. Air Force, Wright Air Development Center.]
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