Abstract
In order to improve the efficiency and safety of vertical hydraulic transport systems for non-spherical particles, a new pipeline transport system with a tangential jet inlet is adopted in this study, and a modified non-spherical drag coefficient model is used to analyze the liquid–solid flow characteristics based on the CFD-DEM (Computational Fluid Dynamics-Discrete Element Method) coupling method. The focus of the study is on the influence of different tangential flow proportions in terms of the velocity distribution, the vorticity, the total pressure, the concentration and drag force of particles of various shapes. The conveying efficiency is measured according to the fluid velocity distribution and the particle concentration, and the safety of conveying is evaluated according to the flow structure and drag force of the particles. The result shows that the velocity of the swirling pipes is significantly higher than the straight pipe. With the increase of the tangential flow proportion, the swirling number and the vorticity magnitude increase, and the vortex core is broken and merged more quickly. Furthermore, the concentration gap and axial drag force gap between particles of various shapes are reduced with the effect of swirling flow, the particle concentration increases, and the particles of each component are uniformly mixed and transported.
Highlights
In recent years, the rapid development of the industry makes terrestrial mineral resources increasingly exhausted
In order to ensure the Reynolds number, turbulence intensity and particle sphericity in the verification experiment were close to the conditions of this paper, the study of Ren et al [20] on non-spherical particle pneumatic spouted bed was selected for verification in this paper
In order to improve the efficiency and safety of vertical hydraulic transport systems for non-spherical particles, a new pipeline transport system with a tangential jet inlet is adopted in this study, and a modified non-spherical drag coefficient model is used to analyze the liquid-solid flow characteristics based on the CFD-DEM coupling method
Summary
The rapid development of the industry makes terrestrial mineral resources increasingly exhausted. The transportation of coarse particles is becoming more and more common in the field of industrial transportation, while the application and research of traditional axial flow transportation are mainly suitable for fine particles. To solve this dilemma, many scholars have conducted research on optimized flow structure. In order to further push the numerical calculation of vertical hydraulic ore migration to the actual results, the various forms of particles are modeled and are based on CFD-DEM; it is very important to use the appropriate non-spherical resistance coefficient formula to study the mixed transportation of multi-component particles.
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