Abstract
Coanda nozzle studied in this work is classified as a jet pump with a shape resembling the Laval nozzle. Compressed air is blown into the nozzle through a peripheral slit upstream of the throat. The air flows near the nozzle wall due to the Coanda effect and air-powder mixtures are sucked into the convergent nozzle. It is known that cohesive powders are dispersed after passing through this nozzle. Therefore, this nozzle seems to be useful as an apparatus to supply powders into a classifier. In order to investigate the effect of the internal flow in the Coanda nozzle on the dispersion of cohesive powders, three-dimensional mean flow and turbulent characteristics inside the nozzle were measured by a single inclined hot-wire anemometer. It was clarified from these measurements that the Reynolds stress played an important role in dispersing cohesive powders, and normal stress was much greater than the shear stress.
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