Acoustic separation of submicron solid particles in air

摘要: Abstract The use of ultrasound to continuously separate submicron particles suspended in air is investigated a rectangular channel with adjustable height. An electrostatic transducer used generate standing wave the 50–80 kHz frequency range and experience forces within acoustic field causing them concentrate at pressure nodes. To assess effect several key design parameters on separation efficiency, simple method based light scattering implemented provide information particle concentrations as function position channel. images acquired are processed yield efficiency metric that evaluate acoustic, flow geometrical parameters. results show that, qualitative agreement theoretical models, maximum increases amplitude sound wave. also linearly proportional frequency, when it varied between 50–80 kHz. On other hand, average fluid velocity less pronounced than expected, suggesting our not limited by interaction length particles. parallelism reflector relative investigated.