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Cyclone separators are used in many processes to remove powders for collection in a wide range of diameters. When the cyclone separator is used as a classi cation device that requires high e ectiveness, the 50% cut-o size (Dp50) is restricted to less than several microns owing to the strong centrifugal force. We developed a cyclone-type classi er to e ectively classify coarse particles collected by the normal cyclone, as discussed in our previous study. The classi er comprises inner and outer collection boxes with a sloping channel region between the upper sections. The sloping channel could derive the additional air, called blow-up ow, from the tangent nozzle established in the outer box. The blow-up ow becomes con uent with the main swirling ow of the cyclone. In the channel, the ne particles a ected by the drag of the blowup ow were collected in the inner box. Additionally, the coarse particles a ected by the centrifugal force induced by the swirling ow were collected in the outer box. The previous study, regarding a classi er with a channel length of 6 mm, demonstrated that Dp50 and the e ectiveness of the classi cation κ, which is the ratio of the 25% cut-o size to the 75% cut-o size (Dp25/Dp75), increase linearly with the increase in blow-up ow rate (Δq). In this study, we increased the channel length from 6 to 23 mm. This resulted in the following bene cial characteristics for separating acrylic particles having a size distribution of 15–35 μm. Unlike the previous study, Dp50 depended on the main ow rate at the entrance regardless of Δq since the increase in Δq increases the centrifugal force, which acts simultaneously on the Dp50 particles, and the drag force. Meanwhile, κ increased signi cantly with the increase in Δq. The classi er classi ed the particles with high e ectiveness (κ ranging from 0.75 to 0.92).

Classification Characteristics of a Cyclone Type Classifier with Improved Collection Boxes for Separating Particles near the Wall Surface