Research Article
Coal and Gangue Underground Pneumatic Separation Effect Evaluation Influenced by Different Airflow Directions
Table 1
Materials properties.
| | Parameter | Value | Units |
| | Ball | | Diameter | 50~100 | mm | | Number | 300 |
— | | Density | 2700 | kg/m3 | | Normal stiffness | 1 × 106 | N/m | | Shear stiffness | 1 × 106 | N/m | | Friction coefficient | 0.7 |
— |
| | Air | | Density | 1.205 | kg/m3 | | Viscosity | 1.8 × 10−6 | Pa⋅s |
| | Wall | | Normal stiffness | 1 × 106 | N/m | | Shear stiffness | 1 × 106 | N/m | | Friction coefficient | 0.3 |
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