Abstract
Centrifugal particle size classification by a gas centrifuge which produces a forced vortex was investigated at reduced pressures. In this method, different particle trajectories cause the formation of a continuous gradation of particle size on the rotor wall. Here, particles in the subsieve and submicron ranges were classified with good resolution because the ''Cunningham correction'' increases as pressure decreases. Also, the computed solutions gave excellent agreement with the experimental results. The numerical solutions with and without the integral term for non-uniform motion have been compared, the approximate equation of best fit for the drag coefficient of spherical particles being used in both cases.
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