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Introduction. The Classical Geldart’s Diagram and the New Type of Gas-Fluidization Behavior

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

Abstract

A typical fluidized bed consists of a vertical vessel closed at the bottom by a porous plate on which a bed of particles is resting. A fluid is supplied to the powder bed from below. At sufficiently high gas flow, the gas pressure drop balances the material weight per unit area and the bed expands in the so-called fluidized state. Traditionally, fine particles were impossible to fluidize by gas due to their strongly cohesive behavior. However, a new class of powders has arisen in the last few years that can be uniformly fluidized in a nonbubbling fluid-like state. Fine particles in these special powders aggregate according to a dynamic aggregation process, which ends up with the formation of porous light aggregates that can be fluidized by a gas, much like coarse beads are fluidized by a liquid. In this chapter, the classical Geldart diagram and the newly-reported fluid-like behavior exhibited by this special class of fine powders are reviewed.

Keywords

Fumed Silica Atomic Layer Deposition Fluidization Behavior Minimum Fluidization Interparticle 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.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Faculty of PhysicsUniversity of SevillaSevillaSpain

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