3つのタービン翼を備えた縦型撹拌槽の液混合特性について，逆混合モデルを適用して逆流量および交換流量におよぼす多孔板型仕切板の開孔率，撹拌速度の影響を実験的に検討した．槽径DTは0.10 m, 翼径Diは槽径DTの1/2とした．3段縦型撹拌槽の逆流量f，供給流量q，交換流量Qの間にf=Q−q/2の関係が成立した．交換流量は撹拌速度nと開孔率Arに比例して大きくなった．3段縦型撹拌槽の修正無次元交換流量Q/（nDi3Ar）は，撹拌レイノルズ数NReが1×103–6×103の範囲では撹拌レイノルズ数の約0.2乗に比例して大きくなり，撹拌レイノルズ数NReが6×103以上では約0.17でほぼ一定となる．
In applying a backmixing model of liquid mixing characteristics in vertical vessels with three multiple impellers, the effects of the opening ratio of a perforated partition plate and the stirring speed on the backflow rate and the exchange rate of liquid were experimentally investigated. The vessel diameter DT was 0.10 m and the impeller diameter Di was one-half of the vessel diameter DT. In the vertical stirred vessels with three multiple impellers, the relationship of the backflow rate f to the feed flow rate q and the exchange rate Q was established as f=Q−q/2. The exchange rate Q increased in proportion to the stirring speed of impellers n and the opening ratio of a perforated partition plate Ar. The value of the modified dimensionless exchange rate in the vertical vessels with three impellers Q/(nDi3Ar) was proportional to the agitated Reynolds number NRe to the power of 0.20 when the range of the agitated Reynolds number NRe was 1×103 to 6×103, and it was almost constant at 0.17 when the agitated Reynolds number NRe was greater than 6×103.
3段縦型撹拌槽における液の逆混合と交換流量
KKR_45_1_1_5
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