Raising the Efficiency of Coagulation of Dispersed Particles by the Action of Ultrasonic Vibrations on Gas-Dispersed Flo
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Journal of Engineering Physics and Thermophysics, Vol. 93, No. 6, November, 2020
RAISING THE EFFICIENCY OF COAGULATION OF DISPERSED PARTICLES BY THE ACTION OF ULTRASONIC VIBRATIONS ON GAS-DISPERSED FLOWS IN INERTIAL DUST COLLECTORS V. N. Khmelev, V. A. Nesterov, and A. V. Shalunov
UDC 534.29.66.084:534-13
The authors have presented results of experiential investigations of the process of ultrasonic coagulation of dispersed particle in a swirling flow. The investigations were conducted using the proposed and developed test bed implementing a two-stage removal of fine particles. At the first stage (agglomeration), the formation of a swirling flow and the ultrasonic pre-coagulation of fine particles are ensured. At the second stage, high-efficiency trapping of particles preformed at the first stage is attained using a cyclone. As a result of the experimental investigations, the authors have established the prospects of using a two-stage removal of fine particles and have revealed the optimum conditions of ultrasonic action on a swirling gas-dispersed flow that ensure an enlargement of 4.5 times of particles in the range of RM2.5 particle sizes which is the most hazardous for humans. Keywords: ultrasound, gas purification, coagulation, acoustic field, fractional efficiency. Introduction. Despite the proven efficiency in the use of aerosols of various substances in many braches of industry and medicine, their uncontrolled stay in an air medium results in extremely adverse impacts on humans and on the surrounding fauna and flora. We known of the presence of a clear link between the level of pollution of the atmosphere with fine aerosols of nonbiological origin and the human mobility and morbidity [1]. The toxicological and epidemiological investigations of recent years have revealed a positive correlation between the number of fine particles RM2.5 in air and the increase in mortality [2], and also the frequency of cardiovascular and respiratory diseases [3, 4]. The adverse action of fine aerosols may go outside the respiratory system due to the crossing of the epithelium of pulmonary alveoli and extrapulmonary translocation [5]. It has been established that the extrapulmonary translocation of the insoluble part of aerosol particles may lead to an accumulation of toxic material in human organs, such as liver, kidneys, brain, or heart [6]. A confirmation of the extremely severe hazard of fine aerosols may be the investigation of L. Calderon-Garciduenas, A. Solt, C. Henriquez-Roldan et al., who have established the link of the long-term exposure to polluted urban air to the sudden death of healthy children and young adults because of the altered innate immune response caused by neuroinflammation which is induced by the accumulation of particles in olfactory-bulb neurons [7]. All the aforesaid points to the extreme importance of searching for ways of protecting of the air medium against fine aerosols of man-made origin. Unfortunately, the efficiency of inertial gas-cleaning equipment (cyclones, centrifugal apparatuses, et
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