Ultrasonic dispersion system design and optimization using multiple transducers

摘要

Ultrasonic wave can be widely used in different steps of nonomaterial synthesizing processes. The most obvious is dispersing of materials in liquids in order to break particle agglomerates. Known types of systems which are used to this purpose, composed of a liquid tank and a high power ultrasonic generator. In this paper, an ultrasonic dispersion system has been proposed and designed with new method of particle dispersing strategy. The main advantage of the proposed is decreasing dispersion time and increasing the particles size uniformity. It assumed that the mix of particles and liquid medium is passing through a cubical pipe. Suitable number of transducers embedded on one side of the pipe with optimum distance from each other, so that the ultrasonic intensity can be focused on some cavitations zones to stimulate dispersion function gradually. Evaluating of the optimum placement of transducers is calculated and simulated using FEMLAB package (COMSOL multi-physics 3.4). The ultrasound intensity profile is obtained from the pressure field distribution. This provides a prediction across the geometry of active cavitations zones, which are crucial for the optimization of the transducers placing. The results can then be used to increase dispersion systems efficiency in a real time controlled application. Simulation results show a better performance compared to the conventional methods.