INFLUENCE OF SURFACE MICROSTRUCTURE ON IMPACT BEHAVIOR OF SMALL PARTICLES IN DIFFERENT ENVIRONMENTS

The purpose of this work is to characterize the effect of the microstructure of various surfaces on the impact behavior of small particles (200-2200 μm) with dry and wet surfaces. Methodology: conducting experimental studies and DEM modeling on the collision of small particles with unpolished, polished, and structured dry surfaces and surfaces with a layer of liquid. Results: as a result of the experimental studies and numerical modeling, we defined the main regularities of the processes of collision of particles of various sizes with various types of surfaces (polished, channel and pyramidal microstructures), the effect of viscous forces on the collision process, the change in the restitution (recovery) coefficient when a particle collides with a dry and wet surfaces. Scientific novelty: the process of collision of small particles with various surfaces is evaluated and the experimental results are compared with the results of numerical simulations. Practical value: the obtained research results can be used in the development of equipment for the processing of discrete materials with particle sizes of 200 - 2200 microns, such as grinders, mixers, presses, conveyors, etc., namely in the analysis and calculations of the interaction of discrete materials with working surfaces such equipment.