Discrete Element Method (DEM) and Experimental Studies of the Angle of Repose and Porosity Distribution of Pellet Pile

Abstract

The lumpy zone in a blast furnace is composed of piles formed naturally during burden charging. The properties of this zone have significant effects on the blast furnace operation, including heat and mass transfer, chemical reactions and gas flow. The properties of the layers mainly include the angle of repose and porosity distribution. This paper introduces two methods, the Discharging Method and the Lifting Method, to study the influence of the packing method on the angle of repose of the pile. The relationships of the angle of repose and porosity with physical parameters are also investigated. The porosity distribution in the bottom of a pile shows a decreasing trend from the region below the apex to the center. The coordination number of the particles is employed to explain this change. The maximum of the frequency distribution of it was found to show a negative correlation to the static friction coefficient, but becomes insensitive to the parameter as the static friction coefficient increases above 0.6.

Calibration of Selected Bulk Biomaterials Parameters for DEM Simulation of Comminution Process. Case Study: Corn and Rice Grains

“…The values of static friction coefficient in the simulation, which provides good agreement with physical experiment were higher for both, corn and rice grains, than values of static friction coefficient obtained on the experimental determination on shear properties apparatus. This confirms, similarly as in other previous research [52][53][54], that the simulation of bulk materials should be validated in specific bulk tests such as angle of repose, hopper discharge test and others, to adjust the physical properties determined based on the experiment.…”

Numerical Analysis of the Relationship between Friction Coefficient and Repose Angle of Blast Furnace Raw Materials by Discrete Element Method

“…This method considers two types of motion: translation and rotation, expressed by Newton’s second law of motion. The elastic contact model used in this work is the Hertz-Mindlin (no slip) model with RVD Rolling Friction compatibility model [ 33 , 34 , 35 ], adopting a Coulomb law of friction. This model is a commonly used in DEM simulations due to its accuracy and efficiency in force calculation.…”

Comparison of physicochemical properties of three types of bamboo shoot powders

“…The resting angle of a material indicates the ability of the material particles to agglomerate, while the sliding angle indicates the ability of the material particles to adhere to a contact surface (Maa et al, 2004); the magnitude of the value of the sliding angle is related to the good or bad powder flowability (Wei et al, 2019). As shown in Table 3, the resting angles of the three bamboo shoot powders were significantly different from one another, as were their sliding angles (P < 0.05).…”