Abstract
Recently, there are great requirement for ultra fine powder in IT industry. Especially, the request of the diameter control of ultra fine powder is increasing. Pneumatic type ultra fine powder separator or classifier, is one of the equipment which meet the request. But, there is no study which makes clear the flow condition quantitatively and qualitatively. The purpose of this study comes out of a check of being the inner flow which can give a large centrifugal force to all particles. The flow of pneumatic classifier is investigated by flow visualizations in tuft grid and oil dot methods, and measurement of gas velocity. As the results, this classifier has a large revolution velocity of flow to be able to classify ultra fine particle in high accuracy.
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