Abstract The mixing characteristics of floating particle dispersion process in an eccentric stirred tank with dislocated fractal impellers were investigated using computational fluid dynamics (CFD) and experimental analyses. Solid concentration distribution, axial solid concentration profile, cloud height, solid integrated velocity, power consumption and just drawdown speed were investigated. Results showed that dislocated fractal impeller can enhance solid integrated velocity and fluid turbulent fluctuation intensity compared with dislocated pitched blade impeller, and eccentric agitation coupled with dislocated fractal impeller could destroy the typical circulation loops and symmetric flow field and improve the axial circulation efficiency of floating particles on the basis of dislocated fractal impeller. Eccentric agitation coupled with dislocated fractal impeller could further enhance the floating particle dispersion homogeneity (MI) and decrease the just drawdown speed (N jd) on the basis of dislocated fractal impeller and dislocated pitched blade impeller at the specific power consumption. Meanwhile, eccentric ratio of 0.3 or 0.4 was optimal for the floating particle mixing process in this work.

中文翻译：

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带有错位分形叶轮的偏心搅拌罐中的漂浮颗粒混合特性

摘要 采用计算流体动力学（CFD）和实验分析方法研究了带有错位分形叶轮的偏心搅拌罐中漂浮颗粒分散过程的混合特性。研究了固体浓度分布、轴向固体浓度分布、云层高度、固体综合速度、功耗和刚降速。结果表明，与错位变桨叶轮相比，错位分形叶轮可以提高固体综合速度和流体湍流脉动强度，偏心搅拌结合错位分形叶轮可以破坏典型循环回路和对称流场，提高漂浮颗粒的轴向循环效率。基于错位分形叶轮。在错位分形叶轮和错位斜叶轮的基础上，偏心搅拌结合错位分形叶轮可以进一步提高漂浮颗粒分散均匀性（MI），降低刚降速（N jd）。同时，偏心比为 0.3 或 0.4 是本工作中浮动颗粒混合过程的最佳选择。