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  4. Particle segregation in an annular shear cell
 
conference paper not in proceedings

Particle segregation in an annular shear cell

Chen, Yanan  
•
Ancey, Christophe  
•
Gray, John
December 2, 2024
7th Southern Workshop on Granular Materials

Particle segregation is a widespread process that affects particle composition in granular materials. Particles tend to segregate into distinct regions according to their size, density, and shape. To date, most studies investigate particles segregating in gravity direction. Less studied is the segregation whose direction deviates from gravity direction. To study this process, we conducted experiments by shearing bi-dispersed granular mixtures in an annular shear cell. Refractive-index matching (RIM) technique was applied to visualize inner particle composition. And we reconstructed three-dimensional particle velocity map from Particle Tracking Velocimetry (PTV). In experiments, radial segregation was observed apart from axial segregation. Small particles tended to accumulated radially to central regions, while large particles gathered in outer regions. We observed radial particle convection from the three-dimensional velocity map, this convection is similar to the secondary flow in the tea leaf paradox. Radial pressure gradient may be the force source for this convection, and it leads to a higher bed surface in central regions than outer regions. The segregation velocity is largest in outer regions since particles here endure a higher shear rate. Furthermore, we found that particle transport was largest when the transport contribution from small particles matched that of large particles.

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Type
conference paper not in proceedings
Author(s)
Chen, Yanan  
•
Ancey, Christophe  
•
Gray, John
Date Issued

2024-12-02

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LHE  
Event nameEvent acronymEvent placeEvent date
7th Southern Workshop on Granular Materials

SWGM7

Puerto Varas, Chile

2024-12-02 - 2024-12-05

Available on Infoscience
April 9, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/248958
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