CFD-DEM Simulation of Reverse Circulation Pneumatic Cuttings Removal during Coal Seam Drilling

Figure 8

Cuttings flow pattern under different gas velocities: (a)  = 15 m/s, M_c = 0.14 kg/s, (b)  = 20 m/s, M_c = 0.14 kg/s, (c)  = 25 m/s, M_c = 0.14 kg/s, (d)  = 30 m/s, M_c = 0.14 kg/s, and (e)  = 35 m/s, M_c = 0.14 kg/s.

(a)

(b)

(c)

(d)

(e)