Wear Characteristics of Dense Fine Particles Solid‐Liquid Two‐Phase Fluid Centrifugal Pump with Open Impellers

Abstract

The demand for a centrifugal pump with open impellers for conveying dense fine particles in solid-liquid two-phase flow has increased significantly in actual engineering. The wear of dense fine particles on the centrifugal pump is also exceedingly prominent, which affects the engineering efficiency and economic benefits. The two-phase flow in the open centrifugal pump is three-dimensional and unsteady; the movement of high-volume concentration particles in the centrifugal pump and its mutual influence on the two-phase flow, which results in the calculation of wear, are very intricate. To study the wear characteristics of the centrifugal pump with open impeller with high-volume concentration particles more accurately, numerical simulation and experimental comparison are carried out for the impeller wear of dense fine particles transported by the centrifugal pump with open impellers. Considering the relationship between particles and walls, we used the Fluent 18.0 built-in rebound function and wear model. The RNG k-ε model and the DDPM model were adopted in the numerical simulation, and the numerical solution for centrifugal pump wear was performed under flow rate (9.6 m3·h−1, 12.8 m3·h−1, 16 m3·h−1, and 19.2 m3·h−1), different particle sizes (0.048 mm, 0.106 mm, 0.15 mm, 0.27 mm, and 0.425 mm), and different particle volume concentrations (10%, 15%, 20%, 25%, and 30%), respectively. By comparing the serious wear positions of the impeller, the experimental results correspond well with the numerical simulation, which can be used to predict and study the wear characteristics of the impeller. The results show that the most serious area of blade wear is the middle part of the pressure surface, followed by the middle part of the upper part of the blade. The wear of the impeller is greatly affected by relevant parameters, such as pump flow rate, particle diameter, and particle volume concentration. These results can provide some basis for the wear-resistant design of dense fine particle impeller.

Numerical simulation of the influence of mixed sand on erosion characteristics of centrifugal pump

“…Noon and Kim (2016) applied Finnie erosion model to predict the erosion morphology of volute of lime slurry pump, and the results showed that the erosion rate of volute increased with the increase of impact velocity, mass concentration and particle size. Wang et al (2021) found that the wear of centrifugal pump impeller is greatly affected by relevant parameters such as pump flow, particle diameter and particle volume concentration. Lai et al (2021) predicted the wear characteristics of centrifugal pump wall based on E/CRC wear model and discussed the effects of particle size and concentration on EC 39,6 the wear characteristics of centrifugal pump impeller.…”

“…Noon and Kim (2016) applied Finnie erosion model to predict the erosion morphology of volute of lime slurry pump, and the results showed that the erosion rate of volute increased with the increase of impact velocity, mass concentration and particle size. Wang et al. (2021) found that the wear of centrifugal pump impeller is greatly affected by relevant parameters such as pump flow, particle diameter and particle volume concentration.…”

Influence of Blade Thickness on Solid–Liquid Two-Phase Flow and Impeller Wear in a Ceramic Centrifugal Slurry Pump

“…In the Euler-Lagrange model, the solid particles are particularly tracked in the Lagrangian frame of reference, rather than being treated as an extra Eulerian phase. Complete information on the behavior and residence time of individual particles and better details regarding mass and heat transfer are available, but the method is expensive in terms of computational resource demand [18][19][20]. The Discrete Element Method (DEM) uses DEM and CFD methods to iteratively solve for the particle motion and the fluid flow field in order to achieve momentum balance between the liquid and solid phases.…”