Radiation Force

Acoustophoresis is the process by which ultrasonic standing waves separate  particles based on their acoustic properties . In order to characterize the acoustic properties of colloid particles, we use acoustic radiation force from traveling ultrasonic waves to displace particles in a large water bath. Experimental measurements are compared to theoretical values calculated from the three equations derived to calculate the acoustic radiation force on  compressible spherical particles from traveling ultrasound waves.  The three equations account for varying forms of dissipation: zero, weak, and strong. In this project we tested: traveling waves of various frequencies and pressures, polystyrene particles of different radii,  surrounding media of varying viscosity.



Updated 7/6/16