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Updated: Feb 7, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
From acoustic radiation pressure to three-dimensional acoustic radiation forces
1National Center for Physical Acoustics and Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA.
Abstract:
This paper presents three-dimensional acoustic radiation forces exerted by an arbitrary field on an obstacle as a sum of two parts due to momentum transfers by ingoing and outgoing spherical waves, respectively. This view of momentum conservation establishes a connection of the force with asymmetry of far fields and acoustic radiation pressure exerted by a plane wave on a planar reflector. These geometrical interpretations and physical aspects are useful for finding and interpreting special force conditions by examining far-field patterns and scattering functions of sound fields. Multipole expansion of the force as a function of beam shape coefficients and scattering functions is simplified for connection with complex phase shifts of scattering functions. A relation of the scattering function dependence in the small-particle limit is identified.
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