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Screen Blade Turbine Impeller 에 의한 액체혼합 제 2 보
김용익,강웅기,신건용 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.4
Baffle 裝置를 안했을 경우에는 screen blade turbine을 使用하였을 때나 flat blade turbine을 使用하였을 때의 所要動力이 差가 없고 거의 비슷하다. 4 個의 Baffle 장치를 한 경우는 screen blade turbine을 使用하였을 때가 flat blade turbine 을 使用하였을 때 보다 所要動力이 훨씬 적다. 특히 multi-stage system 에서는 screen blade turbine 을 使用하면 動力節約을 크게 할 수 있다. The effect of the screen blade turbine impeller on power requiement in stirred mixer was investigated. Power data were measured by the dynanomic method. The range of the impeller rotational speed was from 120rpm to 1,540rpm. In an nnbaflled system, power data for the three types (of the impeller) are much the same. In a baffled system, power data for the screen blade turbines are much less than the flat blade turbine.
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Screen Blade Turbine Impeller 에 의한 액체혼합 제 1보
김용익,강웅기,신건용 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.4
screen blade turbine을 使用하였을 때가 flat blade turbine을 使用했을 때보다도 mixing effect가 優越하다. Screen hole에는 거의 無關하다 할 수 있다. (32mesh∼200mesh range에서 實驗해본 結果에 依해서) Multi-stage solvent extraction 工程에서 screen blade turbine을 使用하면 mixing effect를 向上시킬 수 있다. The effect of the screen blade turbine impeller on mixing was investigated by the droplet size measurements. The droplet size was measured by using the photographic method. A dilute solution of sebacyl chloride in carbon tetrachloride was dispersed in water by stirring in a baffled mixing tank. After stirring for a few minutes to achieve dispersion, a small quantity of agneous (70%) hexamethylene diamine was quickly added to the water phase. Agitation was continued for a short time (less than a minute) and then terminated. Discrete droplets (Nylon 6-10) settled to the bottom. A photograph of a random sample of encapsulated drops was made. Discrete droplets were not formed below 200 r.p.m(impeller rotational speed). The diameter of the droplet formed for the screen blade turbine was less than that for the flat blade turbine. In other words, the mixing effect of the screen blade turbine was superior to that of the flat blade turbine. The droplet size was ranged from 0.3㎜ to 3.6㎜. The minimum droplet diameter was 0.3㎜ when the impeller rotational speed was 800 r.p.m. In unbaffled tank, the diameter range of droplets was from 0. 56㎜ to 3.60㎜ for the 6-flat blade turbine and 0.45㎜ to 2.50㎜ to the 6-screen blade turbine. In 4-baffled tank, it was from 0.32㎜ to 3.25㎜ for the 6-flat blade turbine and 0.30㎜ to 2.45㎜ for the 6-screen blade turbine. The fine screen blade turbine was similar to the rough screen blade turbine in both the power requirements and the droplet size.
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