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Outline
To investigate the collision characteristics of grinding balls inside the cylinder of a vertical stirred mill during operation, a laboratory-scale vertical stirred mill was used as the research subject. Based on the Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD), a DEM-CFD simulation model was developed, taking grinding balls, slurry, and the agitator as the objects. The collision characteristics of grinding balls and their variation along the axial direction were systematically investigated based on five aspects, including the number of collisions, normal and tangential collision energies, and normal and tangential collision forces. The results show that collisions among grinding balls account for 90.5% of the total number of collisions, which is significantly higher than the number of collisions between grinding balls and the grinding cylinder. The tangential collision energy among grinding balls is approximately 1.4 times that of the normal collision energy, while the normal collision force is approximately 6.2 times that of the tangential collision force, indicating that the grinding effect of the grinding balls is more pronounced in the tangential direction. Grinding balls located between the bottom and the 3/8 mark of the cylinder exhibit collision characteristics marked by high collision frequency, high collision energy, and low collision force, which effectively refine the materials. The grinding effect in other areas is relatively small, suitable for rapid materials grading and allowing materials that meet the particle size conditions to overflow from the cylinder. This research achievement provides theoretical guidance for optimizing mill design and improving grinding efficiency.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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