Study On Particle System Movement And Mixing In Different Rotary Devices

Particulate matter is common in daily life and industrial production,especially in industrial applications.It is of great significance to study the motion law and mixing efficiency of particle system in different mixing devices.The motion law and mixing efficiency of single-component and multi-component particle systems in different mixing devices were studied,and the influence of particle size ratio,filling rate,rotating speed,eccentricity and drum shape on mixing efficiency was analyzed.The main results are as follows:The filling rate,rotational speed and particle size ratio have certain influence on the center of vortex in the experiment of single component particle system of circular non-eccentric rotating device.With the increase of filling rate,the position of vortex center is close to the center of drum.When the filling rate is greater than 50%,the vortex center stays in the center of the drum.The dynamic and static Angle of any particle system increases with the increase of rotating speed.With the increase of particle size and the decrease of filling rate,the center of vortex gradually moved to the sliding surface of particles,and the center of vortex gradually disappeared.In addition,the filling rate has little effect on the dynamic rest Angle,and the rotational speed has great effect on the dynamic rest Angle.When the filling rate is small,the center position of the vortex changes greatly with the rotational speed,and the center position of the vortex is dispersed.With the increase of filling rate,the distribution range of vortex center becomes smaller and smaller.The maximum rising height of particle system increases with the increase of rotating speed.When the filling rate is about 50%,the maximum rising height is greatly affected by the speed,while when the sliding surface of the particle system is far away from the center of the roller,the rising height is less affected by the speed.By studying the mixing experiment of multi-component particle system in the roller,the influence of the degree of eccentricity,rotating speed,filling rate and particle size ratio on the degree of particle mixing in each stage was analyzed.In the early stages,velocity and filling rate were the main factors,while degree of eccentricity and particle size distribution were secondary factors.In the intermediate stage of particle mixing,particle size distribution and rotational speed are the main influencing factors,while the influence of eccentricity and filling rate is weak.The particle size distribution is the main factor,and the velocity is the secondary factor.In the study of the particle system in the elliptical rotating device,the dynamic static Angle at different positions is related to the resultant force on the particle system.When the long axis is parallel to the resultant force of gravity and friction,the dynamic Angle of rest is the largest.The filling rate has a very significant effect on the mixing degree of particles,and the cylinder shape has a significant effect on the mixing degree of particles,and the rotating speed has almost no effect.The smaller the filling rate,the greater the ratio of the long axis to the short axis,and the better the mixing effect.