| Issue |
Europhys. Lett.
Volume 50, Number 3, May I 2000
|
|
|---|---|---|
| Page(s) | 319 - 325 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2000-00273-1 | |
| Published online | 01 September 2002 | |
Dynamics of mixing and segregation processes of grains
in 
blender by NMR imaging investigation
1
Centre de Recherche sur la Matière Divisée,
UMR 6619 CNRS
Université d'Orléans - 45071 Orléans cedex 2, France
2
Laboratoire de Physique Pharmaceutique,
UMR 8612 CNRS
Université Paris XI - 92296 Châtenay-Malabry cedex, France
3
Laboratoire de Mécanique Sols-Structures-Matériaux,
UMR 8579 CNRS
Ecole Centrale Paris - 92295 Châtenay-Malabry cedex, France
Corresponding author: porion@cnrs-orleans.fr
Received:
20
December
1999
Accepted:
21
February
2000
Tridimensional Magnetic Resonance Imaging (MRI) was used to study
the mixing and segregation processes in a Turbula mixer
using binary mixtures of sugar beads. A segregation index S was defined to study
the homogeneity and
the kinetics of the mixing/segregation processes.
When the ratio of bead diameters 
is approximately 1,
the mixing process is observed,
but segregation occurs as soon as is greater than 1.1.
Moreover, the segregation appears as a faster process than mixing in the Turbula blender.
PACS: 45.70.Mg – Granular flow; mixing, segregation and stratification / 81.05.Rm – Porous materials; granular materials / 87.61.-c – Magnetic resonance imaging
© EDP Sciences, 2000
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