Research Article
CFD-DEM Simulation of Reverse Circulation Pneumatic Cuttings Removal during Coal Seam Drilling
Table 1
Settings of simulation parameters.
| Item | Parameter | Unit | Value |
| Drill cuttings | Poisson ratio | — | 0.3 | Shear modulus | Pa | 1 × 109 | Density | kg/m3 | 1400 |
| Drill pipe | Poisson ratio | — | 0.29 | Shear modulus | Pa | 7.9 × 1010 | Density | kg/m3 | 7800 |
| Contact of cuttings and cuttings | Contact model | — | Hertz-mindlin | Recovery coefficient | — | 0.5 | Static friction coefficient | — | 0.6 | Rolling friction coefficient | — | 0.05 |
| Contact of drill cuttings and drill pipe inner wall | Contact model | — | Hertz-mindlin | Recovery coefficient | — | 0.5 | Static friction coefficient | — | 0.4 | Rolling friction coefficient | — | 0.05 |
| Atmosphere | Density | kg/m3 | 1.225 | Dynamic viscosity | kg/(m·s) | 1.7894 × 10−5 |
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