The National Science Foundation awarded Northwestern University a $461,982 Project Grant under the Engineering federal grant program (CFDA 47.041) to develop a fundamental understanding of fine particle de-mixing in granular flows. Using discrete element method computer simulations validated with experiments, the University will characterize the size and spatial distributions of interstices between large particles through which fine particles transit under various flow conditions and particle size ratios. At the individual particle level, contact forces, ballistic interactions, and free sifting percolation kinematics will be analyzed. The goal is to develop an accurate, physics-based predictive model for segregating fine particles, similar to existing models for smaller size ratios. This work has the potential to transform understanding and control of large and fine particle segregation/mixing from empirical approaches to a validated theoretical model, with implications for dry lubrication and geophysical flows involving multiple particle sizes. The period of performance is from June 1, 2022 through May 31, 2025.
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