吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒子径の影響

抄録

In the vacuum system of pneumatic conveying, the authors have proposed, that a suction nozzle equipped with an injection pipe at the center, would provide a highly-dense and highly-efficient method of transporting powders and particles. In this paper, we examine the effect of particle diameter of them. The experiment was carried out with five spherical glass beads in ranges from 49 μm to 272 μm when a mean particle diameter x_m is expressed in a volumetric median diameter. As a result, it was found that the change of mean particle diameter has a negligibly small effect on the nozzle performance except in the case of x_m = 49 μm. This was confirmed from the particle behavior by flow visualization. In the case of x_m = 49 μm, we were able to discuss the impact of agglomerative property from the evaluation of fluctuating pressure on the wall surface in the suction nozzle.