Abstract
In one of the proposals for a classifier, an injection port is mounted at the suction mouth, and sand ( relatively large particles) and muddy deposits ( relatively small particles ) which are deposited under a body of water are fluidized before the particles are collected. The maximum diameter of the particles lifted up is determined only by the suction velocity of water. It was clarified from the results of flow visualization in the vicinity of the classifying region that good separations are achieved for several combinations of spherical glass beads. By analyzing the image of the visualized region, the effects of the injection on the classified volume and the effects of small bead diameter on the classified time could be discussed quantitatively.
