水平回転円すい型容器内粒子偏析挙動に関する検討 低臨界回転速度比領域における軸方向偏析機構

Abstract

To clarify the segregation mechanism of solid mixtures in the axial direction of a horizontal rotating conical vessel, i.e. the axial segregation mechanism, the trajectory of a particle cascading on the surface of particle bed in the vessel was calculated by a cascading model of the particles.As a result, it was estimated that a particle was transported from the wider end of the vessel to the narrower one by cascading on the warped bed surface reflecting the axial distribution of the cascading surface angle, which is associated with the distribution of the critical rotating speed ratio of the vessel in its axial direction. The axial traveling trajectories of particles cascading on the warped surface could be experimentally confirmed by using two kinds of tracer particles differing in properties in a horizontal rotating conical vessel. It was obtained that the axial segregation of particles was given by two kinds of the axial traveling behavior, given by (1) cascading behavior of particles on the warped surface from the wider end of the vessel to the narrower one and (2) rolling one along the tongue of the particle bed from the narrower end to the wider one.The final axial segregation of solid mixtures was discussed according to the axial traveling behavior (1) and (2) of the particles cascading close to the surface of particle bed with the radial segregation of the mixtures in a horizontal rotating conical vessel.