Collect. Czech. Chem. Commun. 1997, 62, 1698-1709

On the Transition from Homogeneous to Bubbling Fluidization

Miloslav Hartmana, Zdeněk Beranb, Václav Veselýa and Karel Svobodaa

a Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 165 02 Prague 6-Suchdol, Czech Republic
b Department of Food Chemistry and Biochemical Engineering, Technical University Brno, 637 00 Brno, Czech Republic


The onset of the aggregative mode of liquid-solid fluidization was explored. The experimental findings were interpreted by means of the dynamic (elastic) wave velocity and the voidage propagation (continuity) wave velocity. For widely different systems, the mapping of regimes has been presented in terms of the Archimedes number, the Froude number and the fluid-solid density ratio. The proposed diagram also depicts the typical Geldart's Group A particles fluidized with air.

Keywords: Particulate and aggregative fluidization; Transition; Mapping of regimes.