Abstract
An experimental study on the segregation of particles when subjected to vibrational energy has been made. Radioactive traces techniques were used to follow the movement of the powder. The method did not disturb the bed and thus the segregation could be measured at various time intervals. It was found that the powder properties and the amplitude and frequency of the vibrations had a profound effect on the results obtained. In free-flowing powders, segregarion was readily induced. Powder which demostrated incipient cohesion had pronounced segregation only at a critical vibrational energy. Truly cohesive powders exhibited very tittle segregation once the powder had packed down to its final bulk density.
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