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The Fluidlike Behavior of Fine and Ultrafine Powders Fluidized by Gas

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Part of the Particle Technology Series book series (POTS, volume 18)

Abstract

Fine powders traditionally have been classified as Group C materials according to Geldart’s classification scheme. They are not capable of being fluidized by a gas because interparticle forces are exceedingly large compared to particle weight, which causes cohesive aggregation. Consequently, when Group C powders are subjected to a gas flow, they tend to rise as a slug of solids or to form channels through which the gas will escape rather than being distributed through the bulk. Typical examples are talc, flour and starch. In this chapter, we review observations on a different class of fine powders which exhibit a completely diverse gas-fluidization behavior resembling the nonbubbling fluid-like behavior shown by most noncohesive granular materials when fluidized by liquids.

Keywords

Hurst Exponent Interparticle Force Tensile Yield Stress Toner Particle Interparticle Attractive Force 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Valverde, J.M., Ramos, A., Castellanos, A., Watson, P.K.: The tensile strength of cohesive powders and its relationship to consolidation, free volume and cohesivity. Powder Technol. 97, 237–245 (1998) CrossRefGoogle Scholar
  2. 2.
    Valverde, J.M., Castellanos, A., Quintanilla, M.A.S.: Self-diffusion in a gas-fluidized bed of fine powder. Phys. Rev. Lett. 86, 3020–3023 (2001) ADSCrossRefGoogle Scholar
  3. 3.
    Cody, G.D., Goldfarb, D.J., Storch, G.V. Jr., Norris, A.N.: Particle granular temperature in gas fluidized beds. Powder Technol. 87(3), 211–232 (1996) CrossRefGoogle Scholar
  4. 4.
    Chaouki, J., Chavarie, C., Klvana, D., Pajonk, G.: Effect of interparticle forces on the hydrodynamic behavior of fluidized aerogels. Powder Technol. 43, 117–125 (1985) CrossRefGoogle Scholar
  5. 5.
    Brooks, E.F., Fitzgerald, T.J.: Fluidization of novel tendrillar carbonaceous materials. In: Fluidization, pp. 217–224. Engineering Foundation, New York (1986) Google Scholar
  6. 6.
    Morooka, S., Kusakabe, K., Kobata, A., Kato, Y.: Fluidization state of ultrafine powders. J. Chem. Eng. Jpn. 21, 41–46 (1988) CrossRefGoogle Scholar
  7. 7.
    Pacek, A.W., Nienow, A.W.: Fluidisation of fine and very dense hardmetal powders. Powder Technol. 60, 145–158 (1990) CrossRefGoogle Scholar
  8. 8.
    Valverde, J.M., Castellanos, A., Mills, P., Quintanilla, M.A.S.: Effect of particle size and interparticle force on the fluidization behavior of gas-fluidized beds. Phys. Rev. E 67, 051305 (2003) ADSCrossRefGoogle Scholar
  9. 9.
    Valverde, J.M., Quintanilla, M.A.S., Castellanos, A., Mills, P.: Experimental study on the dynamics of gas-fluidized beds. Phys. Rev. E 67, 016303 (2003) ADSCrossRefGoogle Scholar
  10. 10.
    Jackson, R.: The Dynamics of Fluidized Particles. Cambridge University Press, Cambridge (2000) zbMATHGoogle Scholar
  11. 11.
    Homsy, G.M.: Nonlinear waves and the original of bubbles in fluidized beds. Appl. Sci. Res. 58, 251–274 (1998) ADSzbMATHCrossRefGoogle Scholar
  12. 12.
    Duru, P., Guazzelli, E.: Experimental investigation of the secondary instability of liquid-fluidized beds and the formation of bubbles. J. Fluid Mech. 470, 359–382 (2002) ADSzbMATHCrossRefGoogle Scholar
  13. 13.
    Valverde, J.M., Castellanos, A., Quintanilla, M.A.S., Gilabert, F.A.: Effect of inclination on gas-fluidized beds of fine cohesive powders. Powder Technol. 182, 398–405 (2008) CrossRefGoogle Scholar
  14. 14.
    Boycott, A.E.: Sedimentation of blood corpuscles. Nature (London) 104, 532 (1920) ADSCrossRefGoogle Scholar
  15. 15.
    Acrivos, A., Herbolzheimer, E.: Enhanced sedimentation in settling tanks with inclined walls. J. Fluid Mech. 92, 435–457 (1979) ADSzbMATHCrossRefGoogle Scholar
  16. 16.
    Galvin, K.P., Nguyentranlam, G.: Influence of parallel inclined plates in a liquid fluidized bed system. Chem. Eng. Sci. 57(7), 1231–1234 (2002) CrossRefGoogle Scholar
  17. 17.
    Doroodchia, E., Fletcherb, D.F., Galvina, K.P.: Influence of inclined plates on the expansion behaviour of particulate suspensions in a liquid fluidised bed. Chem. Eng. Sci. 59, 3559–3567 (2004) CrossRefGoogle Scholar
  18. 18.
    Valverde, J.M., Castellanos, A., Quintanilla, M.A.S.: The memory of granular materials. Contemp. Phys. 44, 389–399 (2003) ADSCrossRefGoogle Scholar
  19. 19.
    O’Dea, D.P., Rudolph, V., Chong, Y.O.: The effect of inclination on fluidized-beds. Powder Technol. 63, 169–178 (1990) CrossRefGoogle Scholar
  20. 20.
    Gilbertson, M.A., Yates, J.G.: The tilting fluidized bed: A re-examination. Powder Technol. 89, 29–36 (1996) CrossRefGoogle Scholar
  21. 21.
    Hudson, C., Briens, C.L., Prakash, A.: Effect of inclination on liquid-solid fluidized beds. Powder Technol. 89, 101–113 (1996) CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Faculty of PhysicsUniversity of SevillaSevillaSpain

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