The Fluidlike Behavior of Granular Materials Fluidized by Liquids
- 1.1k Downloads
In contrast with the nonbubbling, solid-like behavior exhibited by gas-fluidized beds of slightly cohesive powders stably fluidized (Geldart A), most beds of noncohesive granular materials can be fluidized by a liquid in a nonbubbling, fluid-like regime. Accordingly, gas-fluidized beds and liquid-fluidized beds have been traditionally considered as separate systems displaying radically different behaviors. In this chapter, empirical observations on liquid-fluidized beds are reviewed as well as empirical criteria formulated to predict the onset of macroscopic bubbling in these systems. An insight is given into the gas-fluidization behavior of fine conditioned powders, revealing a straightforward analogy with the nonbubbling fluid-like behavior of liquid-fluidized beds despite being fluidized by a gas.
KeywordsParticle Image Velocimetry Froude Number Lead Shot Water Bubble Bubble Breakup
- 2.Wilhelm, R.H., Kwauk, M.: Fluidization of solid particles. Chem. Eng. Prog. 44, 201–218 (1948) Google Scholar
- 5.Harrison, D., Davidson, J.F., de Kock, J.W.: On the nature of aggregative and particulate fluidisation. Trans. Inst. Chem Eng. 39, 202–211 (1961) Google Scholar
- 13.Richardson, J.F., Zaki, W.N.: Sedimentation and fluidization: Part I. Trans. Inst. Chem. Eng. 32, 35–53 (1954) Google Scholar