Acoustophoretic separation of airborne millimeter-size particles by a Fresnel lens.

ABSTRACT: We numerically demonstrate acoustophoretic separation of spherical solid particles in air by means of an acoustic Fresnel lens. Beside gravitational and drag forces, freely-falling millimeter-size particles experience large acoustic radiation forces around the focus of the lens, where interplay of forces lead to differentiation of particle trajectories with respect to either size or material properties. Due to the strong acoustic field at the focus, radiation force can divert particles with source intensities significantly smaller than those required for acoustic levitation in a standing field. When the lens is designed to have a focal length of 100 mm at 25 kHz, finite-element method simulations reveal a sharp focus with a full-width at half-maximum of 0.5 wavelenghts and a field enhancem

SUBMITTER: Cicek A 

PROVIDER: S-EPMC5333108 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature