https://doi.org/10.1051/epjconf/202124903011
Designing non-segregating granular mixtures
1
Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA
2
Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA
* e-mail: r-lueptow@northwestern.edu
Published online: 7 June 2021
In dense flowing bidisperse particle mixtures varying in size or density alone, large particles rise (driven by percolation) and heavy particles sink (driven by buoyancy). When the two particle species differ from each other in both size and density, the two segregation mechanisms either enhance (large/light and small/heavy) or oppose (large/heavy and small/light) each other. In the latter case, an equilibrium condition exists in which the two mechanisms balance and the particles no longer segregate. This leads to a methodology to design non-segregating particle mixtures by specifying particle size ratio, density ratio, and mixture concentration to achieve the equilibrium condition. Using DEM simulations of quasi-2D bounded heap flow, we show that segregation is significantly reduced for particle mixtures near the equilibrium condition. In addition, the rise-sink transition for a range of particle size and density ratios matches the predictions of the combined size and density segregation model.
A video is available at https://doi.org/10.48448/hrek-dy85
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
