The Effect of rotor speeds and flow rates on the flow pattern in an annular centrifugal extractor

遠心抽出器内の流動状態に及ぼすロータ回転数及び供給流量の影響

國井 佳奈子*; 三角 隆太*; 仁志 和彦*; 上ノ山 周*; 平野 弘康 ; 荻野 英樹; 佐野 雄一  

Kunii, Kanako*; Misumi, Ryuta*; Nishi, Kazuhiko*; Kaminoyama, Meguru*; Hirano, Hiroyasu; Ogino, Hideki; Sano, Yuichi

混合部内の流速分布を測定し、ロータ回転数や供給流量が流動状態に及ぼす影響について検討した。低回転数の場合は槽底からロータ下部まで液に浸かった状態にあり、槽底近傍の液流速は供給流量にほぼ比例することを確認した。高回転数の場合、液は固定羽根近傍とロータ下部近傍の2領域に分かれて存在し、槽底近傍の液流速は供給流量に比例しないことが明らかとなった。

The flow patterns at 1750 and 3500 rpm of a rotor speed were compared each other. In both cases, the liquid is flowing along a rotational direction of the rotor in the region surrounded by two vanes on the vessel bottom and the vessel wall, and then the liquid goes into the separation zone in the rotor. At lower speed, the mean velocities are roughly proportional to flow rates. At higher speed, the liquid is separated into two regions in the height direction, that is, one of them is near the vanes and another is around a lower side of the rotor. The mean velocities around the vessel bottom are not proportional to flow rates. The reason is inferred that the liquid fed in the vessel takes a shortcut and goes into the rotor instead of passing through between two vanes.