This study focuses on hydrodynamic characteristics of a shear thinning fluid agitated in a 3D multiphase reactor using a dual helical ribbon impeller. A combination of Computational Fluid Dynamics (CFD) simulation and Population Balance Model (PBM) were employed to study the gas-liquid interactions at various impeller speeds. The standard $k-\epsilon$ model and Eulerian multiphase approach were used to predict better quantities of turbulent flow parameters and its characteristics. Particle Image Velocimetry (PIV) was used to measure the velocity field for the model validation. Simulation results indicated that the bubble breakage and coalescence rate was intensified due to an increase in rotational speed. However, bubble breakage is still the dominant phenomenon since the bubbles would hit the walls and blads due to the turbulent intensity. Further, the helical ribbon impeller significantly reduces the viscosity of the fluid and improves the mixing efficiency that is confirming the authors’ previous experimental results. Furthermore, formation of static vortices adversely affects the efficiency of mixing process proving that an increase in impeller speed does not necessarily enhance the mixing perfiormance.

Further, the helical ribbon impeller significantly reduced the viscosity of the fluid and enhanced mixing efficiency, thereby confirming the authors’ previous experimental results.

这项研究的重点是使用双螺旋带状叶轮在3D多相反应器中搅拌的剪切稀化流体的流体动力学特性。计算流体动力学（CFD）模拟和种群平衡模型（PBM）的组合用于研究各种叶轮速度下的气液相互作用。标准$ķ--\epsilon$模型和欧拉多相方法被用来预测更好的湍流参数及其特性。粒子图像测速（PIV）用于测量速度场以进行模型验证。仿真结果表明，由于转速的增加，气泡的破裂和聚结率增加。然而，气泡破裂仍然是主要的现象，因为气泡会由于湍流强度而撞击到壁和叶片上。此外，螺旋带叶轮显着降低了流体的粘度并提高了混合效率，这证实了作者先前的实验结果。此外，

此外，螺旋带式叶轮显着降低了流体的粘度并提高了混合效率，从而证实了作者先前的实验结果。