An experimental investigation into the micromixing performance of coaxial mixers in a viscous system is reported, in which the iodide‐iodate reaction system is chosen to quantitatively characterize the product distributions. The effects of feeding time, feeding position, impeller speed, inner impeller configuration, and operation mode on the segregation index, Xs, are examined. It is revealed that the feeding near the inner impeller benefits micromixing and should be regarded as the preferred position. The presence of the rotating outer impeller causes the micromixing performance of the coaxial mixer to be significantly better than the single‐shaft mixer. While an increase in the outer impeller speed has a limited influence on micromixing, the inner impeller speed is the dominant influencing factor, that is, the Xs decreases obviously when the inner impeller speed is increased. On the other hand, the coaxial mixers with multiple and axial inner impellers have a better micromixing performance at the same specific power consumption, P_V, than that with single and radial inner impellers. Among the configurations consisting of a Rushton impeller (RT), six‐straight‐blade turbine impeller (SBT), and six‐pitched (45°)‐blade turbine impeller (PBT), the Xs of the coaxial mixer is always the smallest at the same P_V when the PBT + RT configuration is used as the inner impeller. In addition, it is found that the difference in Xs that results from various operation modes is small in terms of power consumption; however, the co‐rotation mode is still recommended for the micromixing of the coaxial mixer due to its excellent performance in general.

中文翻译：

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粘性系统中同轴混合器微混合特性的实验研究

报告了对同轴混合器在粘性系统中的微混合性能的实验研究，其中选择了碘化物-碘酸盐反应系统以定量表征产物分布。进料时间，进料位置，叶轮速度，内部叶轮配置和运行方式对偏析指数X的影响s，被检查。结果表明，靠近内叶轮的进料有利于微混合，应视为首选位置。旋转的外叶轮的存在使同轴混合器的微混合性能明显优于单轴混合器。虽然外部叶轮速度的增加对微混合的影响有限，但内部叶轮速度是主要的影响因素，也就是说，当内部叶轮速度增加时，X s明显减小。另一方面，带有多个和轴向内叶轮的同轴混合器在相同的比功率P _V下具有更好的微混合性能。，而不是单个和径向内叶轮。在由Rushton叶轮（RT），六叶片涡轮叶片（SBT）和六螺距（45°）叶片涡轮（PBT）组成的配置中，同轴混合器的X s始终是最小的当PBT + RT配置用作内部叶轮时，其在相同的P _V下。另外，发现由各种操作模式引起的X s的差异在功耗方面较小；然而，由于同轴混合器的总体性能出色，因此仍建议在同轴混合器中进行微旋转。