Abstract
The flow nearby a suction-pipe intake used for a manganese mining system is very complicated. we have to suck up particles efficiently, over wider range around a suction pipe. In this research, on purpose to clarify the sucking characteristics and the flow near the suction-pipe intake, the authors investigate experimentally about the case where a coarse particle sucks up. First, in order to clarify the mechanism of a particle behavior, the authors measured suction force acting on the particle. Furthermore, in order to clarify the influential range and the characteristics of the suction force, the authors measured the critical condition to attract a particle. Finally, in order to know the flow near the suction-pipe intake, the visualization by the smoke-wire method was conducted. As a result, (i) the suction force becomes maximum at r_s/D≅0.2,(ii) density ratio influences the critical condition to attract a particle, (iii) near the suction-pipe intake, the flow is nearby potential flow.
