Abstract
Particle characteristics affect porosity mainly via three factors: dimensionless particle size distribution, particle shape and absolute particle size, giving various packing systems from the simple coarse spherical particle packing to the complicated fine and nonspherical particle packing. Consequently, the modelling of the relationship between porosity and particle characteristics may be carried out by considering these three factors, either successively or simultaneously. This paper presents a review of the work in this area since the early 1980s. The dependence of porosity on particle size, shape and their distributions is examined from typical examples for different packing systems. The need for further development is also discussed.
Highlights
Particle packing, recognised by Dallavalle [1] as a core research area in particle/powder technology, is of prime importance to many industries, the material and mineral industries in particular [2]
As far as particle characteristics are concerned, a situation often encountered in practice, there are three main factors: particle size distribution, particle shape, and absolute particle size
Initial porosity increases with decreasing particle size because of the effect of weak forces if particle size is smaller than a certain value; it varies with particle shape
Summary
Particle packing, recognised by Dallavalle [1] as a core research area in particle/powder technology, is of prime importance to many industries, the material and mineral industries in particular [2]. As far as particle characteristics are concerned, a situation often encountered in practice, there are three main factors: (dimensionless) particle size distribution, particle shape, and absolute particle size. These factors may lead to various complex packing systems from spherical to nonspherical, and/or from coarse to fine particle packing. In the 1980's, significant progress was made in the modelling of the packing of coarse spherical particles [6,7,8,9,10,11,12,13,14,15] On this basis, in the recent years, attempts have been made to model the packing of nonspherical and fine particles [16,17,18,19,20,21]. This paper presents a review of the work in this area and highlights the need for future development
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