Abstract
Fractionation of fine (∼10-μm) particles by their size, density, or both was studied. A laminar flow of suspended particles through a tilted slender tube that slowly rotates around the tube axis separated fine particles into two fractions according to the sedimentation velocity of the particles. The threshold of separation was mainly governed by the rotation period, which depends on the particle size. Nearly spherical particles of silica gel were separated experimentally. A two-step operation yielded a fraction of particles of uniform size (half-width, ∼0.7 μm) with a mean diameter of ∼5 μm. The particle-size threshold was close to the theoretical value
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