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Mixing and Segregation Processes in Turbula Blender

Published online by Cambridge University Press:  01 February 2011

Nathalie Sommier ,
Patrice Porion  and
Pierre Evesque
Nathalie Sommier
Affiliation:
Laboratoire de Physique Pharmaceutique, UMR 8612 CNRS - Université Paris XI, 92296 Châtenay-Malabry cedex, France.
Patrice Porion
Affiliation:
Centre de Recherche sur la Matière Divisée, UMR 6619 CNRS - Université d'Orléans, F-45071 Orléans cedex 2, France.
Pierre Evesque
Affiliation:
Laboratoire de Mécanique MSSM, UMR 8579 CNRS - Ecole Centrale Paris, F-92295 Châtenay-Malabry cedex, France
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Abstract

Magnetic Resonance Imaging (MRI) technique was used to study the mixing and segregation processes of granular materials in a sophisticated tumbling blender (Turbula® mixer) using binary mixtures of sugar beads of different diameters d. Its motion generates mixtures with complex patterns. Effects of some parameters (beads diameter ratio, rotation speed, mixing time) were checked on segregation and mixing processes. We report in this paper, a qualitative and quantitative analysis of these phenomena. A segregation index S was defined to study the homogeneity and the kinetics of the mixing/segregation processes. When the ratio of bead diameters dmax/dmin is approximately 1, mixing process is observed but segregation occurs as soon as dmax/dmin is greater than 1.1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 627: Symposium BB – The Granular State , 2000 , BB5.9
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

1. Oyona, Y., Bull. Inst. Phys. Chem. Res. (Tokyo) 5, 600 (1939);Google Scholar
Oyona, Y. and Ayaki, K., Kagaku Kikai 20, 6 (1956).Google Scholar
2. Donald, M. and Roseman, B., Br. Chem. Eng. 7, 749 (1962).Google Scholar
3. Williams, J. C., Powder Technol. 15, 237 (1976).Google Scholar
4. Bridgwater, J., Powder Technol. 15, 215 (1976).Google Scholar
5. Gupta, S. D., Khakhar, D. V., and Bhatia, S. K., Chem. Eng. Sci. 46, 1513 (1991).Google Scholar
6. Savage, S. B., in Disorder and Granular Media, edited by Bideau, D. and Hansen, A. (North-Holland, Amsterdam, 1993), p. 255.Google Scholar
7. Hogg, R. and Fuerstenau, D. W., Powder Technol. 6, 139 (1972).Google Scholar
8. Hill, K. M., Caprihan, A., and Kakalios, J., Phys. Rev. Lett. 78, 50 (1997); Phys. Rev. E 56, 4386 (1997).Google Scholar
9. Nakagawa, M., Altobelli, S. A., Caprihan, A., Fukushima, E., and Jeong, E. K., Exp. Fluids 16, 54 (1993).Google Scholar
10. Nakagawa, M., Altobelli, S. A., Caprihan, A., and Fukushima, E., in Powders and Grains 97, edited by Behringer, R. and Jenkins, J. (Balkema, Rotterdam, 1997), pp. 447–450.Google Scholar
11. Ehrichs, E. E., Jaeger, H. M., Karczmar, G. S., Knight, J. B., Kuperman, V. Y., and Nagel, S. R., Science 267, 1632 (1995).Google Scholar
12. Kuperman, V. Y., Ehrichs, E. E., Jaeger, H. M., and Karczmar, G. S., Rev. Sci. Instrum. 66, 4350 (1995).Google Scholar
13. Caprihan, A., Fukushima, E., Rosato, A. D., and Kos, M., Rev. Sci. Instrum. 68, 4217 (1997).Google Scholar
14. Jaeger, H. M., Nagel, S. R., and Behringer, R. P., Rev. Mod. Phys. 68, 1259 (1996).Google Scholar
15. Aref, H., J. Fluid Mech. 143, 1 (1984).Google Scholar
16. Ottino, J. M., The Kinematics of Mixing: Stretching, Chaos, and Transport (Cambridge Univ. Press, Cambridge, 1989).Google Scholar
17. Ottino, J. M., Annu. Rev. Fluid Mech. 22, 207 (1990).Google Scholar
18. Schatz, P., Deutsches Reichspatent Nr. 589 452 in Der allgemeinen Getriebeklasse (1933); US Patent Nr. 2 302 804 (1942).Google Scholar
19. Callaghan, P. T., Principles of Nuclear Magnetic Resonance Microscopy (Clarendon Press, Oxford, 1991).Google Scholar
20. Lacey, P. M. C., J. Appl. Chem. 4, 257 (1954).Google Scholar
21. Porion, P., Sommier, N., and Evesque, P., Europhys. Lett. (to be published).Google Scholar
22. Dury, C. M. and Ristow, G. H., Phys. Fluids 11, 1387 (1999).Google Scholar