Table 1: CFD simulation matrix.

Simulation dataDiameter ratio 

Flow behavior index 0.31–0.75
Consistency index (, Pa⋅)1.7–6.3
Yield stress (, )2–8
Zero shear rate viscosity (, Pa⋅s)1100
Fluid density (, 1020
Bulk fluid velocity (, )0.50
Inner pipe rotation speed (, )0
Outer diameter (, )50.8
Inner diameter (, )45.7
Eccentricity 0.50
Cuttings density (, 2650
Avg. cuttings size (mm)1.0 & 4.0
Rate of penetration, ROP (m/s)0.00508