Characterization of the upward motion of an object immersed in a bubbling fluidized bed of fine particles

The frequency of the object rise along the bed is independent of the object properties but influenced by the fluidization material. Comparing to coarse sand and FCC, the objects immersed in fine sand rise less frequently. This is attributed to the relatively longer residence time of the object in the emulsion phase of fine sand particles. The intermittent circulation of the medium and large size Acetal spheres in beds of FCC and fine sand is featured by the low upward and rise object velocities and the very limited height travelled by the object.