Increasing the Efficiency of Coagulation of Submicron Particles under Ultrasonic Action

• Published in: Theoretical foundations of chemical engineering Vol. 54; no. 4; pp. 539 - 550
• Main Authors: Khmelev, V. N., Shalunov, A. V., Golykh, R. N.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2020; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Coagulation; Industrial Chemistry/Chemical Engineering; Shock waves; Static electricity; shock wave; nonlinear effects; submicron particles; coagulation; ultrasound; speed; Smoluchowski equation
• ISSN: 0040-5795; 1608-3431
• DOI: 10.1134/S0040579520030069

The results of studies into the coagulation process of submicron particles (smaller than 1–2.5 μm) under various conditions of ultrasonic exposure are presented to identify the possibility of increasing the efficiency of coagulation. An analysis of the peculiarities of the coagulation process both with a sinusoidal effect and with shock-wave (pulsed) action has made it possible to establish that the shock-wave action provides a coagulation rate of submicron particles that is up to 20 times higher when compared with the sinusoidal effect at the same total energy of exposure. It is shown that the cause of the acceleration of the process is nonlinear effects arising from shock-wave action and affecting the coagulation rate of particles (a change in the cross-sectional area of collision, local medium compaction, and mutual diffusion of the gas surrounding the particle during the transitional flow regime between the free and continuous molecules).