静水中で等速沈降する異比重粒子の水の振動による沈降速度変化

概要

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The velocity of a particle in water depends on both its size and specific gravity. For separation methods, in which separation is done by the difference of particle velocities, such as a jig, a cyclone, or a shaking table, separation by size or specific gravity cannot be completely achieved unless either condition is adjusted to a suitable range in advance. When using the difference of the settling velocity, the size range that should be adjusted before separation is especially called the equal settling ratio. This has only been defined for stationary water, although water movement must be taken into account in the actual separator. In this study, the change of the settling velocity in oscillating water was experimentally investigated for two kinds of particles, which have different specific gravities but the same settling velocity in stationary water, by focusing on the oscillation field which is one of the element movements of a separator. Zirconia (202μm in average) and glass (435μm in average) samples, that are spherical and mono-disperse systems were used. The equal settling ratio becomes smaller while the setting velocities of both samples decrease in oscillating water. That is, the settling velocity in oscillating water becomes more dependent on particle size rather than specific gravity compared to the case in stationary water.
社団法人資源・素材学会の論文
2005-07-25