Physical Mechanisms and Theoretical Computationof Efficiency of Submicron Particles Agglomerationby Nonlinear Acoustic Influence

摘要

This study models the agglomeration of submicron particles when they are exposed todifferent types of ultrasonic waves, viz., sinusoidal waves and shock waves (pulses). The nonlinear effects of the shock waves (the transfer of heat, drop in pressure, change in the particles’collisional cross-section due to Brownian motion, and difference in particle concentration), whichinfluence the particle coagulation rate, are simulated for the first time and evaluated. The resultsreveal the optimum duration for compression and depression shock-wave pulses. Furthermore,given the same total amount of ultrasonic energy, the submicron particles coagulate 20 timesmore quickly with shock waves than sinusoidal waves.