Table 1 Simulation parameter Settings.
From: CFD-DEM simulation of the motion law of magnetic flocs during waste slurry disposal in shield tunnel
| Â | Parameter | Value or type |
|---|---|---|
Magnetic seed particles | Density/(kg m−3) | 5000 |
Particle size/mm | 1.5 | |
Coefficient of rolling friction | 0.01 | |
Coefficient of static friction | 0.70 | |
Poisson 's ratio | 0.3 | |
Elastic modulus/(N2 m−1) | 2.3 × 107 | |
Restitution coefficient | 0.1 | |
Concentration /‰ | 2.5, 3.7, 5.0, 6.2 | |
Surface energy/(J m−2) | 9.04 | |
Contact model | Hertz–-Mindlin with JKR | |
Floc particles | Density/(kg m−3) | 2000 |
Particle size/mm | 5.0 | |
Particle–wall | Coefficient of static friction | 0.50 |
Restitution coefficient | 0.30 | |
Contact model | Hertz–-Mindlin | |
Fluid | Density /(kg m−3) | 998.2 |
Poisson 's ratio | 0.394 | |
Elastic modulus/(N2 m−1) | 2 × 108 | |
Viscosity/(Pa s) | 0.001 | |
Inlet velocity/(m s−1) | 0.4, 0.6, 0.8, 1.0 | |
Decanter centrifuge | Rotary drum speed/rpm | 1000 |
Differential speed/rpm | 15, 20, 25, 30 |
