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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Effect of axial agitator configuration (up-pumping, down-pumping, reverse rotation) on flow patterns generated in stirred vessels
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Effect of axial agitator configuration (up-pumping, down-pumping, reverse rotation) on flow patterns generated in stirred vessels

机译：轴向搅拌器配置（向上泵送，向下泵送，反向旋转）对搅拌容器中产生的流型的影响

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摘要

Single phase turbulent flow in a tank stirred with two different axial impellers, a pitched blade turbine (PBT) and a Mixel TT (MTT), has been studied using Laser Doppler Velocimetry. The effect of the agitator configuration, i.e. up-pumping, down-pumping and reverse rotation, on the turbulent flow field, as well as power, circulation and pumping numbers has bene invesigated. An agitation index for each configuration was also determined. In the down-pumping mode, the impellers induced one circulation loop and the upper part of the tank was poorly mixed. When up-pumping, two circulation loops are formed, the second in the upper vessel. The PBT pumping upwards was observed to have a lower flow number and to consume more power than down-pumping, however,the agitation index and circulation efficiencies were notably higher. The MTT has been shown to circulate liquid more efficiently in the up-pumping configuration than in the other two modes. Only small effects of the MTT configuration on the power number, flow number and pumping effectiveness have been observed.
机译：使用激光多普勒测速技术研究了在装有两个不同的轴向叶轮，变桨叶轮机（PBT）和Mixel TT（MTT）的搅拌槽中的单相湍流。已经研究了搅拌器配置（即，向上泵送，向下泵送和反向旋转）对湍流流场以及功率，循环和泵送次数的影响。还确定了每种配置的搅拌指数。在下降泵模式下，叶轮引起一个循环，罐的上部混合不良。向上泵送时，会形成两个循环回路，第二个循环回路在上部容器中。与向下泵送相比，向上泵送PBT的流量较小，消耗的功率更多，但搅拌指数和循环效率明显更高。已经显示，MTT在上泵配置中比在其他两种模式下更有效地循环液体。仅观察到MTT配置对功率数，流量数和泵送效率的微小影响。

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