Flow regime diagram for vertical pneumatic conveying and fluidized bed systems

►New generalized flow regime diagram for vertical pneumatic conveying and fluidized bed systems ►Influence of the column diameter on the transition velocities is in the range of the experimental error ►Four Geldart classification groups explain the appearance of different fluidization and pneumatic conveying states ►Generalized diagram can be presented by the Archimedes and the Reynolds numbers modified by the solid flow rate or the volumetric concentration of circulating solids and the gas void fraction