Acoustics 

In this work, we develop solutions for a generalized acoustic scattering by a fluidic sphere and the resulting acoustic force exerted on the scatterer. Simulations for the scattered field generated by standing waves are obtained to validate the boundary conditions (right). Experimentally (left), methods for the visualization of the field were built such as a Schlieren imaging technique and an apparatus for the  angular resolved acoustic scattering intensity but both provided no conclusive results. The resulting acoustic trap was able to trap air microbubbles ranging from 40µm to 60µm. The corresponding radiation acoustic force was obtained considering the forces to which the bubbles were submitted: Stokes' drag, buoyancy, and the acoustic force. Results show forces ranging from F ~25µN to F~120 µN. Theoretically, the radiation force upon the bubbles canceled in the direction transverse to the standing wave for the theoretical model and thus the modeling of a focused beam should be considered for a complete plausible description of the phenomenon.