关键词: 颗粒物料, 混合, 计算机仿真, 离散元, 均匀性

Abstract: Propeller mixing is the main materials mixing method at present, which is easy to press the materials with higher friction force. In order to solve this problem, the mixing process of drum without propeller is studied. It was adopt discrete element software EDEM to simulate the mixing process of two kinds of materials in the no-propeller drum, and analyzes the motion characteristic of materials during mixing process. The degree of mixing uniformity was quantitatively characterized by defining the particle mixing uniformity index, which is used to study the influence of particles mumber (10000-20000 particles) and rotating speed (7-22r/min) on the uniformity of the mixture. And the compressive force of particles was investigated as well. It is found that the mixing of two materials can be realized in the mixing process of no-propeller drum, and with the increase of rotating speed, the material can reach even quickly. The compressive force of the material fluctuates with the mixing process. The maximum compressive force is less than 0.6N and stable in the range of 0.1-0.35N. The average value of compressive force is less than 0.015N and stable in the range of 0.005-0.01N. The maximum value is about 20-30 times than the average value. With the increase of particles numbers and roller speeds, the compressive force increases slightly.

Key words: granular materials, mixing, computer simulation, discrete element, uniformity