Fluidization regimes: dense bed and circulating bed
Fluidized beds - General characterization and applications

The fluidization range for particles with a given Archimedean number corresponds to all empty-barrel gas flow velocities U between U _mf and U _t , i.e. Reynolds numbers between Re _mf and Re _pt . This range is wider the higher the ratio Re _pt /Re _mf .

Variations in this ratio, as a function of Ar, can be plotted for different values of ε _mf (figure