Effect of material properties on the packing of fine particles

The packing of fine particles differs from that of coarse particles because of the strong cohesive interparticle forces. Consequently, material properties of particles have a strong effect on the packing structure of fine particles. This article presents a study of this effect by means of discrete element method. Variables considered include sliding and rolling friction coefficients related to the surface forces, and Hamaker constant and particle density related to the body forces acting on a particle. The results are analyzed in terms of porosity, mean coordination number and radial distribution function. It is shown that porosity increases with sliding and rolling friction coefficients as well as the Hamaker constant, but decreases with particle density, and coordination number and radial distribution function vary with these variables in line with porosity. The results have also been used to link the macrostructural property such as porosity to microstructural properties such as coordination number and radial distribution function. It is demonstrated that porosity can be described as a function of the force ratio between the van der Waals force and gravity force on a particle but the relationship varies with the sliding and rolling friction coefficients.

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