dorsal/arxiv
View SchemaReverse segregation and self-organization in inclined chute flows of bidisperse granular mixtures
| Authors | Joseph M. Monti, Joel T. Clemmer, Ishan Srivastava, Leonardo E. Silbert, Gary S. Grest, Jeremy B. Lechman |
|---|---|
| Categories | |
| ArXiv ID | 2601.05940vv1 |
| URL | https://arxiv.org/abs/2601.05940 |
| License | http://creativecommons.org/licenses/by/4.0/ |
Abstract
In the usual segregation scenario for stable inclined chute flows of bidisperse mixtures of fine and coarse spherical particles, coarse particles rise toward the free surface, forming a coarse-rich region atop the flowing pile. Beyond a threshold coarse-to-fine diameter ratio of approximately 4, conversely, the weight of the coarse particles exceeds the segregation driving forces, causing individual coarse particles to sink within the pile and producing a reversed segregation state. However, an understanding of the collective evolution of the pile structure is still lacking when the particle diameter ratio exceeds 4 {\textit{and}} the coarse particle mass fraction is appreciable. To explore this broadly bidisperse limit, we perform discrete element method simulations considering mean particle diameter ratios of up to 8 and coarse particle mass fractions spanning 0.1 to 0.9. The steady-state flow profiles reveal several intriguing behaviors that depend on the diameter ratio and mass fraction. These include a previously identified transition from usual to reverse segregation and a newfound tendency to self-organize into alternating coarse- and fine-rich particle layers stacked along the shear gradient direction, with layer thickness dictated by the coarse particle diameter. A fuller understanding of segregation at this scale could pave the way for enhanced mixing or demixing techniques at the commercial scale.
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"abstract": "In the usual segregation scenario for stable inclined chute flows of bidisperse mixtures of fine and coarse spherical particles, coarse particles rise toward the free surface, forming a coarse-rich region atop the flowing pile. Beyond a threshold coarse-to-fine diameter ratio of approximately 4, conversely, the weight of the coarse particles exceeds the segregation driving forces, causing individual coarse particles to sink within the pile and producing a reversed segregation state. However, an understanding of the collective evolution of the pile structure is still lacking when the particle diameter ratio exceeds 4 {\\textit{and}} the coarse particle mass fraction is appreciable. To explore this broadly bidisperse limit, we perform discrete element method simulations considering mean particle diameter ratios of up to 8 and coarse particle mass fractions spanning 0.1 to 0.9. The steady-state flow profiles reveal several intriguing behaviors that depend on the diameter ratio and mass fraction. These include a previously identified transition from usual to reverse segregation and a newfound tendency to self-organize into alternating coarse- and fine-rich particle layers stacked along the shear gradient direction, with layer thickness dictated by the coarse particle diameter. A fuller understanding of segregation at this scale could pave the way for enhanced mixing or demixing techniques at the commercial scale.",
"arxiv_id": "2601.05940",
"authors": [
"Joseph M. Monti",
"Joel T. Clemmer",
"Ishan Srivastava",
"Leonardo E. Silbert",
"Gary S. Grest",
"Jeremy B. Lechman"
],
"categories": [
"cond-mat.soft"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Reverse segregation and self-organization in inclined chute flows of bidisperse granular mixtures",
"url": "https://arxiv.org/abs/2601.05940",
"version": "v1"
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