Turbulent flow friction reduction effectiveness and hydrodynamic degradation of polysaccharides and synthetic polymers

摘要

AbstractTwo water‐soluble synthetic polymers and several polysaccharides were compared for friction reduction effectiveness during increased exposure to turbulent flow. Solutions were passed through a 0.117 × 41.0 cm fine bore tube at a constant solvent wall shear stress of 4200 dynes/cm2and wall shear rate of 4 × 105sec−1. After one pass through the tube, greatest friction reduction at low polymer concentrations was in the order poly(ethylene oxide)>polyacrylamide>bacterial polysaccharide fromXanthomonas campestris>guar gum. As a result of mechanical degradation, after 40 passes of 40 ppm solutions, friction reduction effectiveness was in the order polyacrylamide>polysaccharide fromXanthomonas campestris>poly(ethylene oxide)>guar gum. Degradation curves, the effect of concentration on degradation, and boundary layer and pipe flow applications are disc