Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD)

<div>Influence of the shape of the bottom groove on the air flow inside the drill bit: (a) air suction effect during the simulation and experiment and (b) tangential velocity at the entrance of the central channel.</div>

Geofluids

fig12

Figure 12

Figure 12: Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD) 

Figure 12 | Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD) 