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Effect of compaction history on the fluidization behavior of fine cohesive powders

Jose Manuel Valverde and Antonio Castellanos

  • Faculty of Physics, Universidad de Sevilla, Avenida Reina Mercedes s/n, 41012 Sevilla, Spain

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Phys. Rev. E 73, 056310 – Published 24 May, 2006

DOI: https://doi.org/10.1103/PhysRevE.73.056310

Abstract

Fine particles agglomerate in the fluidized state due to the strength of interparticle attractive forces as compared to particle weight. Interparticle adhesion can be largely increased by consolidation stresses applied during powder handling. As a consequence, fragments of the consolidated powder may persist when the powder is fluidized, which gives rise to large agglomerates of strongly adhered particles in fluidization. This history-dependent effect can be minimized by coating the particles with surface additives such as silica nanoparticles. In this paper, we investigate the effect of high consolidation stresses σc previously applied to samples of silica-coated fine particles on their fluidization behavior. Our experimental measurements show that, even though homogeneous fluidization is still observed, the average agglomerate size and fractal dimension of the agglomerates increase as σc is increased. Bed expansion in the fluidized state is hindered by previously applied high consolidations, which we attribute to an increase of the largest stable size of mesoscopic fluid pockets. As a consequence, we observe that the initiation of macroscopic bubbling is delayed up to larger values of the fluid velocity.

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Phys. Rev. E 73, 056310– Published 24 May, 2006
  • Received 10 February 2006

© 2006 American Physical Society

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