Abstract Solid-liquid suspension characteristics in a stirred tank with four pitched-blade impellers, circle package impellers, and punched circle package impellers were studied via computational fluid dynamics (CFD) simulation. A classical Eulerian-Eulerian approach coupled with the standard k-ε turbulence model was adopted to simulate the solid-liquid two-phase turbulent flow. The effects of impeller speed, power consumption, impeller type, aperture size/ratio, solid particle diameter and liquid viscosity on the solid particle suspension quality were investigated. Results showed that the solid particle suspension quality was improved with an increment in the impeller speed. Punched circle package impeller could reduce the just suspension speed and improve the level of homogeneity for solid-liquid mixing process on the basis of four pitched-blade impeller and circle package impeller. The optimum aperture ratio and aperture diameter were 11.8% and 8 mm, respectively, for solid particles suspension process in this work. Smaller particle diameter led to smaller settling velocity and higher solid particle suspension quality. More viscous liquid was easier for sustaining the solid particles in suspension state. Meanwhile, punched circle package impeller can reduce the power consumption compared with four pitched-blade impeller and circle package impeller at the same impeller speed, and enhance the solid integrated velocity, turbulent kinetic energy, and turbulent kinetic energy dissipation rate of solid-liquid mixing system at the same power consumption.

中文翻译：

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冲压圆形叶轮搅拌槽中固液悬浮特性的计算流体动力学模拟

摘要 通过计算流体动力学(CFD)模拟研究了四斜叶叶轮、圆包叶轮和冲压圆包叶轮搅拌槽内的固液悬浮特性。采用经典的欧拉-欧拉方法结合标准的 k-ε 湍流模型来模拟固液两相湍流。研究了叶轮转速、功率消耗、叶轮类型、孔径/比、固体颗粒直径和液体粘度对固体颗粒悬浮液质量的影响。结果表明，随着叶轮转速的增加，固体颗粒悬浮质量得到改善。冲孔圆包叶轮在四斜叶叶轮和圆包叶轮的基础上，降低了刚悬浮速度，提高了固液混合过程的均匀度。在这项工作中，固体颗粒悬浮过程的最佳孔径比和孔径分别为 11.8% 和 8 mm。较小的粒径导致较小的沉降速度和较高的固体颗粒悬浮液质量。更粘稠的液体更容易使固体颗粒保持悬浮状态。同时，冲孔圆包叶轮与相同叶轮转速下的四斜叶叶轮和圆包叶轮相比，可降低功耗，提高固体积分速度、湍流动能、