吹出し口を備えたサンドコレクタの基礎研究

回収粒子形状と流動化特性

抄録

In fundamental experiments on a sand collector with an injection port at the collecting mouth, the fluidized region was visualized and the effects of particle shape and size on the fluidized character-istics were discussed using spherical glass beads and volcanic ash as the collected particles. As a result, it was concluded that the fluidized volume for both types of particles takes a maximum value at a diameter of about 2001um and the values for both types of particles are almost the same irrespective of the particle diameter. As the diameter becomes smaller than 200 um, the fluidized volume decreases since the contact force among the particles in the particle bed increases. On the other hand, in the case of diameters larger than 200 um, the aspects of fluidization are different for the two types of particles because of increase in the gravity force acting upon the particles.