Numerical Simulation and Analysis of Large-scale Particle Fluid System Based on CFD-DPM Method

doi:10.3901/JME.2022.22.450

Abstract

Abstract: The correlation mechanism between the main operating parameters of large-scale complex particle fluid system and the morphology of multiple physical fields is not clear, and the experimental research methods are difficult to accurately describe the coupling relationship between these parameters and mass characteristics. In order to explore the working mechanism of multi-physics coupling during the operation of vertical mills, numerical calculation is carried out by establishing a coarse-grained non-analytical CFD-DPM coupling model, and the effects of operating parameters on the vertical mill flow field, particle classification, particle size distribution and the finished product is analyzed. The simulation results are in good agreement with the actual operating results. It is verified that the numerical calculation model can effectively simulate the dynamic powder separation process of large-scale particle-fluid system. The results show that the air volume of the system and the rotating speed of the powder separator directly affect the cutoff diameter of the vertical mill centrifugal classification and the fineness of the finished product. When other parameters remain unchanged, the cutoff diameter increases and the specific surface area of the finished product decreases with the increase of the system air volume. When only changing the rotating speed, the cutting particle size decreases and the specific surface area increases with the increase of rotating speed.

Key words: particle-fluid system, numerical simulation, particle size distribution, CFD-DPM coupling method, Rosin-Rammler distribution

CLC Number:

TG156

LI Hao, CHENG Jia-hui, SUN Chun-ya, LI Ke, XIE Gui-zhong, WANG Hao-qi, HUANG Rong-jie, HAO Bing, LIU Jun, WANG Xin-chang. Numerical Simulation and Analysis of Large-scale Particle Fluid System Based on CFD-DPM Method[J]. Journal of Mechanical Engineering, 2022, 58(22): 450-461.

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