Abstract:
An annulus having 0.5 eccentricity, with the diameters ratio of 0.5, measuring three
velocity elements consisted of feebly fluid deprived of non-Newtonian shear thinning
elasticity and rotational inner cylinder at 300rpm. At laminar region of flow,
concerned by 0.2% solution of CMC (Sodium carbo methyl cellulose), based on
polymer, it was observed that near the outer pipe wall, a counter rotating flow was
observed which was not evidenced at 9200 Reynolds number. The Non-Newtonian
fluid will depict the same effects of rotation having more even axial flow through the
annulus alike with the simulated work. In all the cases the maximum tangential
velocities will be found in the thinnest gap. With the extreme values of bulk velocities
near the inner pipe, the secondary flow circulation with the Newtonian fluid at various
Reynold’s No. will be found in the direction of rotation. The rotation did not influence
due to turbulence moderations & in the smallest gap region, Non-Newtonian fluid will
decrease. At low Reynolds numbers, the flow resistance of both fluids will be raised
with rotation & with the analogous of non-rotating flow resistances will also be
reduced by increasing Reynolds no. For the same Rossby number, the tangential
velocities will be found equal. Numerical simulation for the transportation of cuttings
in drilling of oil wells, based on the sliding mesh for rotational pipe with the
analogous of grainy flow on the kinetic theory basis. The comportment of the drilling
fluid was relied on the power-law model. By comparing the outcomes with the
literature experimental data, it has been evidenced that impact of rotated inner pipe
follows the similar trend as originated in the experimental data.
