Pressure Flow of the Non-Newtonian Fluid in an Eccentric Tube with a Rotating Inner Cylinder

Part 2 : Experiments

Abstract

The authors consider experimentally the pressure flow of the non-Newtonian fluids in an eccentric double walled tube with a rotating inner cylinder. Experiments are carried out to measure the pressure gradient, the angle of the secondary flow region and the presure distribution on the outer cylinder using aqueous solutions of hydroxy ethyle celluslose (HEC). Results are summarized as follows :
1) The flow rate was enhanced by the rotation of an inner cylinder. In the relation between the flow rates in the stationary (Q_S) and the rotationary (Q_R) condition, the difference in Q_R by each eccentricity increased with effect of the rotation against the axial velocity.
2) The angle of the secondary flow region increased with decreasing number of rotations and increasing press ure gradient.
3) The pressure distribution on an outer cylinder was affected by the axial flow and varied in the different manner by the ratio of radius and the eccentricity.
4) Experimental values agree well with the numerical results. Consequently the reliability of the numerical method in the previous paper was confirmed.