abstract
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The spontaneous oscillations of a fluidized bed with a variable volume below the bed support are investigated.
The pressure vs. time dependence of the fixed bed is determined for glassbeads of 3 size ranges and for hematite.
For each case several different bed masses were employed. For the oscillating bed the influence on the frequency of the oscillations of the materials fluidized, the size of the particles, the chamber volume and the superficial gas velocity are studied.
Models of five different authors have been reviewed and a model to describe the relationship between the frequency and various parameters such as chamber volume, bed mass, gas velocity and the pressure drop characteristic (Δp vs. μ) is derived. The latter together with three other models have been evaluated by means of the experimental data.