MODELING THE PROCESS OF PARTICLE FRACTIONATION IN A PNEUMATIC CENTRIFUGAL APPARATUS

The present investigation pertains to simulation of the aerodynamics of a two-phase nonisothermal twisted turbulent fl ow in the vortex chamber of an air-centrifugal classifi er. The gas phase dynamics was determined with the aid of Reynolds equations whose closure was based on the Wilcox turbulence model. The motion of the solid phase of an ultradisperse powder is simulated by a combination of calculations of the motion trajectories of particular particles in a Lagrangian coordinate system. The infl uence of turbulent diffusion of particles and of other factors on the effi ciency of the segregation of particle fractions by size is shown. The reliability of the results obtained is confi rmed by test studies and by comparing numerical results with well-known experimental data.
The present investigation pertains to simulation of the aerodynamics of a two-phase nonisothermal twisted turbulent fl ow in the vortex chamber of an air-centrifugal classifi er. The gas phase dynamics was determined with the aid of Reynolds equations whose closure was based on the Wilcox turbulence model. The motion of the solid phase of an ultradisperse powder is simulated by a combination of calculations of the motion trajectories of particular particles in a Lagrangian coordinate system. The infl uence of turbulent diffusion of particles and of other factors on the effi ciency of the segregation of particle fractions by size is shown. The reliability of the results obtained is confi rmed by test studies and by comparing numerical results with well-known experimental data.
Author:  A. V. Shvab and N. S. Evseev
Keywords:  twisted turbulent fl ow, heat transfer, centrifugal apparatus, fractionation of particles, Wilcox turbulence model
Page:  829