High frequency separation of suspended micro/nanoparticles
Keywords:piezoelectric bimorph, holographic interferometry, mathematical model
The influence of high frequency vibrations on the large volumes of fluids are not sufficiently studied, but the ultrasound separation of microparticles from liquid in microchannels is known technique. Acoustic standing wave technology creates new opportunities to improve advanced particle and cell separating systems. In this paper an interesting case of using the acoustic pressure method in the vertical plane is considered. The frequencies that were used lie below the threshold of the ultrasonic range and are unique in their structure. The case of interaction of a bimorph plate with a suspension is considered. The influence of the presence of a liquid on the change in the resonant frequencies and the effect of the exfoliation and transport of particles in the suspension are of interest.
Using a high-frequency bimorph piezo-actuator, a stable acoustic effect on the micro/nano suspension and the effect of radiation pressure on particles in the slurry was obtained. Investigating the active part of the actuator, an image with peak points of membrane deformation was obtained, which is confirmed by theoretical calculations. An experimental setup of the micro/nano fluid excitation with piezoelectric actuator has allowed us to determine the low-pressure areas of acoustic waves, which collect micro/nanoparticles. Laboratory studies have confirmed the modeling results and the ability to receive higher volumes than in the case of purified particles in a microchannel.