RESEARCH ON AN AERODYNAMIC PARTICLE SEPARATOR (THE EPS)

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Abstract
This report presents an account of the research work carried out in support of the development of a new particle separator.∗ ∗U.S. Patent No. 4,657,667, April 14,1987. View all notes The EPS, as it is designated, produces multiple fractions simultaneously at a high throughput rate. The cut sizes are roughly in the range 10 to 200 µm. The principle is that particles dissimilar with respect to any of size, density, or shape will follow different and distinct trajectories when injected into a uniform laminar flow of air. The report outlines the theoretical analyses and experimental measurements made to verify the design concepts. A detailed model of the flow field permits the calculation of particle trajectories, and hence the prediction of coarse grade efficiency and sharpness of cut. The measurements made with glass spheres and other irregular particles (e.g., carbon, cement) provide a general verification of the analytical results. Sharpness of cut values better than 0.8 are achieved down to cut points of about 10µm. Maximum throughput rates are not yet known, but separations have been made at 480 kg/hr in a separation zone 100 mm wide. Scale-up to larger capacity is straightforward.

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