Abstract
ABSTRACT The effect of rotation on the frictional pressure loss in an annulus has been studied experimentally. A direct comparison with results obtained with a 3D CFD (computational fluid dynamics) code has been performed for laminar flow. Experimental results for three fluids are presented. In this paper we will focus on two effects of rotation in a slim hole annulus. The increase in the frictional pressure loss with high rotation rates for low viscosity fluids which is caused by the onset of centrifugal instabilities. The reduction of the frictional pressure loss with rotation for high viscosity shear thinning fluids.
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