Study on the particle dynamic characteristics in a centrifugal pump based on an improved computational fluid dynamics-discrete element model

机械 计算流体力学 离散元法 物理 湍流 消散 CFD-DEM公司 耗散颗粒动力学模拟 粒子(生态学) 热力学 核磁共振 海洋学 地质学 聚合物
作者
Wei Pu,Leilei Ji,Wei Li,Weidong Shi,Fei Tian,Cui Xiao,Qiaoyue Yang,Yang Yang,Ramesh K. Agarwal
出处
期刊:Physics of Fluids [American Institute of Physics]
卷期号:36 (12)
标识
DOI:10.1063/5.0242078
摘要

To accurately investigate the solid–liquid flow mechanisms within the pump, this study employs an improved Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) approach to examine the solid–liquid interactions in a centrifugal pump. First, the improved CFD-DEM is introduced, focusing on turbulence dissipation near the wall and velocity reconstruction. Then, a comparison is made between the CFD-DEM's performance before and after the enhancements. Finally, an analysis is conducted on how the dynamic characteristics of particles within the pump vary under different solid phase concentration conditions. The study revealed that the particle distribution from the corrected CFD-DEM aligns more closely with the experimental results. At a 2% concentration under the design conditions, the head error was reduced by 0.476%, while the efficiency error decreased by 0.076%. Additionally, as the solid phase concentration increased, there was a corresponding rise in the impact power loss of the particles, dissipative power loss, collision frequency, peak values of particle collisions, and the degree of overlap during these collisions. The comparison revealed that the pressure gradient force has the most significant impact on particle motion. As the pressure gradient force increases, the shear power dissipation of the particles also rises. For solid phase concentrations ranging from 1% to 4%, the average shear power variation during the computation period is between 4.28 × 10−6 W and 5.68 × 10−6 W. As the solid phase concentration increases, the volume fraction of the solid phase distribution on the component wall also gradually rises. These findings provide valuable insights for enhancing the accuracy of research on solid–liquid flow in centrifugal pumps.
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