CFD-DEM coupled calculation of entrained air and particles movement characteristics during particles flow impacting the wall process

摘要

Abstract The bulk materials loading and unloading process is common in industrial plants. In order to understand the dust generation mechanism, a physical model of the particles flow impacting the wall process was established in this study. The CFD-DEM coupled calculation method is used to study the entrained air flow field and the particles flow motion characteristics. The results show that with the increase of the wall angle, the farther away from the impact point from the position where the entrained air reaches a steady state, the escape outline distance is longer; As the drop height increases, the ‘peak’ position of the entrained air of the same section moves backward, and the height of the escape outline is higher; As the mass flow increases, the ‘peak’ value of entrained air velocity gradually decreases, and the height of the escape outline becomes higher. The typical particle energy loss coefficient in the process of particle flow impacting the wall is greatly affected by the wall angle among the three variables. The α increases from 15° to 75°, the φdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$varphi$$end{document} increases from 0.19 to 0.74. The research results can provide a theoretical basis for the control of dust emission in industrial plants.