Hydrodynamics Performance of a Dual Shaft Mixer with Viscous Newtonian Liquids
Hydrodynamics Performance of a Dual Shaft Mixer with Viscous Newtonian Liquids
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DOI：
10.1205/cherd06175
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发表时间：
2007
影响因子：
3.9
通讯作者：
F. Cabaret;Christian A. Rivera;L. Fradette;M. Heniche;P. Tanguy
中科院分区：
文献类型：
--
作者：
F. Cabaret;Christian A. Rivera;L. Fradette;M. Heniche;P. Tanguy
采用粘性牛顿流体，对双轴混合器在层流状态下的混合性能进行了实验和数值研究。采用一种基于快速酸碱变色反应分析的混合定量方法来跟踪罐内的宏观混合演变。利用该方法生成的宏观混合曲线确定了混合次数，并揭示了流动分区和死区的存在。通过与同一轴上两台Rushton涡轮的双叶轮系统的比较，表明双轴混合系统可以消除流动区隔，打破分离区，缩短混合时间。实验结果表明，与同向旋转叶轮相比，反向旋转叶轮的混合次数更少。建立了一种混合时间相关性，用于表征叶轮在反向旋转模式下的强相互作用。数值模拟结果用于突出和解释两种旋转模式之间的全局性能差异。
The mixing performance of a dual shaft mixer with a Rushton turbine installed on each shaft was investigated experimentally and numerically in the laminar regime using viscous Newtonian liquids. A mixing quantification method based on the analysis of a fast acid-base discolouration reaction was used to follow the macro-mixing evolution in the tank. The macro-mixing curves generated by this method were used to determine the mixing times as well as to reveal the presence of flow compartmentalization and dead zones. In comparison with to a dual impeller system with two Rushton turbines on the same shaft, it is shown that the dual shaft mixing system can eliminate the flow compartmentalization, break the segregated regions and reduce the mixing time. Experimental results show that the counter-rotating mode of the impellers give smaller mixing times than the co-rotating one. A mixing time correlation was developed and used to characterize the strong interaction between the impellers when operated in counter-rotating mode. Numerical simulation results were used to highlight and explain the difference in global performance between the two rotating modes.