サイクロンによる粉末選別に関する研究

概要

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In order to find the best condition for separating powder in desirable grain size by a cyclone, we tried to investigate the air current in the cyclone and to find out mechanism of separation. We used a Pitot tube to measure the direction, the pressure and the velocity of air flow in the cyclone. The results are as follows : -(a) The direction of the flow is independent of air velocity and its inclination to the axis decreases according to the distance from the top of the cyclone and the distance from the periphery, slightly increasing near the center. (b) The tendency of the increase and decrease of the air pressure and the tangential velocity are also similar to that of (a). (c) Vertical downward velocity decreases rapidly toward the center from the wall and becomes nearly zero except in the neighbourhood of the center. (d) We observed the ascending flow of air at the center. We took photographs to observe the aspects of the powder separation in the cyclone, and we found there are three zones except the core in the cyclone. The first is the neighbourhood of cyclone wall where most of powder separated aggregate, and the second is near the core where small part of powder contained in this zone. The last one is in the middle of the two zones where there is no powder. We proved these results agree with our illustration which is based on the experiment of the air flow.
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