Application of Electrostatic Effect for Cleansing Finely Divided Aerosol from Air
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Journal of Engineering Physics and Thermophysics, Vol. 93, No. 4, July, 2020
APPLICATION OF ELECTROSTATIC EFFECT FOR CLEANSING FINELY DIVIDED AEROSOL FROM AIR M. Yu. Stepkina, O. B. Kudryashova, A. A. Antonnikova, and A. A. Zhirnov
UDC 538.9
The possibility of intensifying the processes in gas-dispersed systems with coagulated particles of different dimensions and the efficiency of air purification depend on the characteristics of the field created by electrodepositing plants. This work was carried out with a view of optimizing the parameters of electrodepositing systems to increase the rate of aerosol cloud deposition in an air medium. The theoretical and experimental studies are oriented to improving the methods of removing harmful aerosol formations in the air space by exposure to external electrostatic fields. This paper describes experimental investigation of coagulation and deposition of aerosol particles by inducing external fields in a closed volume with account for different technical parameters of devices for trapping different kinds of finely divided particles. To obtain the dispersed and concentration characteristics of aerosol, use is made of the method of searching for the solution in the form of a multiparameter function of the size distribution of particles realized as part of a laser measuring complex. Keywords: finely divided aerosol, drift velocity, deposition, coagulation, critical voltage of corona discharge, multiparameter distribution function. Introduction. A large number of studies deal with charging aerosol particles in an electrostatic field [1, 2]. Work [3] yields an estimate of charging currents depending on the corona discharge voltage and numerically models the distributions of the electric field lines described by the Poisson equation in axisymmetric cylindrical coordinates for various configurations of electrodepositing plants. It has been clarified as a result that a decrease in the aerosol flow velocity and an increase in the corona voltage lead to an increase in the mean charge pertaining to one particle. The investigations carried out [3] allow one to forecast diffusion of aerosol particles in the range from 0.01 to 50 μm depending on construction characteristics and service conditions of electrodepositing plants. It is noted in experimental work [4] that the rate of coagulation between charged particles of opposite polarity is two orders of magnitude higher than the corresponding level for uncharged particles. Moreover, the experimental results of work [5] show that the generated ion current is practically independent of a change in the applied voltage or in corona current but the change in the space between the electrodes is a more efficient means of regulating the charging efficiency [6–8]. Whether this is true or not will be revealed theoretically and experimentally in the present work. The purpose of the present work is to theoretically and experimentally investigate the parameters of electrostatic systems with the goal of increasing the rate of aerosol cloud deposition
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