Modeling granular segregation for overlapping species distributions

Modelling segregation of bidisperse granular mixtures varying simultaneously in size and density for free surface flows

“…2019; Gao et al. 2021). However, more research is needed to validate the model for a wider range of particle properties, particularly with respect to the effect of particle size and density ratios on the coefficients and .…”

“…The theoretical framework presented here is consistent with previous studies, which means the extended segregation velocity model of (1.3) should be applicable to not only quasi-2-D bounded heap flow but also other 2-D (Schlick et al 2015b;Xiao et al 2019) and three-dimensional (Isner et al 2020a,b) geometries with known flow kinematics. Moreover, continuous size distributions could be considered in this same framework for polydisperse segregation (Schlick et al 2016;Deng et al 2019;Gao et al 2021). However, more research is needed to validate the model for a wider range of particle properties, particularly with respect to the effect of particle size and density ratios on the coefficients A i and B i .…”

“…However, variation in particle size can create variations in segregation properties, particularly for close to 1 because the size distributions for the two species may overlap (Gao et al. 2021). To assess the impact of a narrow range of particle sizes in combination with differences in particle densities, simulations are also conducted for particle species of uniform size (filled data points in figure 9 for and 1.5).…”

“…One further consideration is that for the simulations up to this point, each particle species has a ±10 % variation in particle diameter, which is a common approach in DEM simulations to avoid ordered packing structures that can occur for identically sized particles. However, variation in particle size can create variations in segregation properties, particularly for R d close to 1 because the size distributions for the two species may overlap (Gao et al 2021). To assess the impact of a narrow range of particle sizes in combination with differences in particle densities, simulations are also conducted for particle species of uniform size (filled data points in figure 9 for R d = 1 and 1.5).…”

Direct Compaction Drug Product Process Modeling

“…Continuum models simplify the flow modeling and are being proven beneficial, see [62] for instance; especially since there is limited agreement on rheological models for granular flow. For blends where segregation could occur, coupling rheology with process-inherent segregation modes is essential [63].…”