The flow feature and local shear rate distribution near the impeller blade in a standard Rushton turbine stirred tank with the aqueous solution of sodium polyacrylate were studied by using particle image velocimetry experiments and computational fluid dynamics simulations. Experimental and simulated results, including average velocity and local shear rate distribution at different rotational speeds, were compared, and good agreement was achieved. On this basis, the numerical methods were used to predict the effects of liquid rheology on the velocity and shear rate distribution. The consistency coefficient affects obviously the velocity fluctuation level but has a limited impact on the flow structure. The power-law index influences significantly the radial jet structure. In addition, the liquid rheology almost has no effect on the average value of the local shear rate near the impeller region, which is proportional to the rotational speed.

中文翻译：

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具有剪切稀化流体的 Rushton 涡轮搅拌罐中流场的计算和实验研究

通过粒子图像测速实验和计算流体动力学模拟，研究了标准 Rushton 涡轮搅拌罐中聚丙烯酸钠水溶液中叶轮叶片附近的流动特征和局部剪切速率分布。实验和模拟结果，包括不同转速下的平均速度和局部剪切速率分布，进行了比较，并取得了良好的一致性。在此基础上，利用数值方法预测了液体流变学对速度和剪切速率分布的影响。一致性系数对流速波动水平影响明显，但对流动结构影响有限。幂律指数显着影响径向射流结构。此外，