化学工学
Print ISSN : 0375-9253
邪魔板のない円筒形攪拌槽内の流動状態
永田 進治山本 一夫氏原 源弘
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ジャーナル フリー

1959 年 23 巻 3 号 p. 130-137

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The velocity distribution of agitated liquid in a cylindrical mixing vessel was measured, using a set of pitot tubes, the composition of which is shown in Fig. 2. Some of the experimental results are shown in Figs. 4, 5, 6 and 8.
As a result, the flow patterns in an agitated vessel were made clear and it was ascertained that, besides the primary circulation flow around the agitator axis, there was a secondary circulation of liquid caused by the discharging flow from the tip of the impeller as shown in Figs. 7 and 9. Integrating the measured velocity distributions, the discharging flow rates of the impellers were determined and the discharging performances of various impellers (Cf. Table 1) were compared, relative to the power consumption. Dimensionless factor, Nq1, defined by the author, was called the coefficient of discharge. The ratio, NP/Nq1 in Table 3, shows the relative power required for performing unit quantity of dis-charge.
Furthermore, the power consumed in the neighbourhood of the impeller (NPimp), that is in the cylindrical domain (Cf. hatched region in Fig. 9), was calculated and compared with that consumed in the outer region of the vessel as shown in Table 4.
From these considerations it is concluded that the improvement in the discharging capacity can be accomplished, to a certain extent, by a properly designed impeller, though we shall have to resort to some other devices for more fundamental improvements.

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