Mechanisms and Kinetics of Separation of Impurities of Large and Small Particles in Gravity Flow of Granular Material

Chemical and Petroleum Engineering - The processes of separation of impurities of particles of different sizes are analyzed under conditions of irregularity of structural and kinematic parameters...     

Continuous Mixing of Granular Materials under Pulse Action on a Segregated Flow of an Intermittently Dosed Component

Theoretical Foundations of Chemical Engineering - A controlled segregated process flows principle was used to design a process of continuous mixing of granular materials with intermittent dosing of...     

Processing of granular materials in controlled segregated flows

General principles of the control of segregated flows of nonuniform particles were developed to intensify the technological processes and enhance the functionality of equipment for processing granular materials. Some results of studying the performance characteristics of a drum apparatus with controlled segregated flows of granular materials in the processes of separation, mixing, and heat and mass exchange at an adjustable ratio of processing times for nonuniform particles were given.     

Segregation kinetics in the rapid gravity flow of granular materials

An experimental analytical method for determining the kinetic segregation coefficient in the rapid gravity flow of a granular material down a rough incline is proposed. It is found that it is possible to predict the velocity of transverse displacement of individual large and small particles in the rapid gravity flow using a single kinetic segregation coefficient for different particle sizes and structural and kinematic characteristics of the flow. A previously proposed equation of segregation kinetics is refined, and its predictive power is analyzed.     

Phenomenological analysis of the interaction of nonelastic incoherent particles in a rapid gravity flow

Interaction of nonelastic incoherent spherical particles in a rapid gravity flow is analyzed. The analysis provides a refinement for the relationship between the pressure, dilatancy, and temperature of the granular medium (energy of mutual displacements of the particles). The equation of state obtained for the granular medium establishes the determined interrelation of the parameters of a rapid gravity flow of cohesionless nonelastic spherical particles and for the first time makes it possible to evaluate the effect of various forms of mutual displacement of particles on the dilatancy of the granular material during a rapid shift. The adequacy of the equation of state of the granular medium is confirmed with the use of the X-ray diffraction method.