Drag reduction of polymer solutions in a pipe with a highly water-repellent wall

摘要

By applying a highly water-repellent wall pipe in the drag reduction of polymer solutions, a flow system in which drag reduction is obtained in both laminar and turbulent flow ranges has been realized. Experiments were carried out to measure the pressure drop in pipes with a higly water-repellent wall and an acrylic resin wall by means of a pressure transducer. the diameter of the pipe was ymm. The polymer solutions tested were PEO15 aqueous solutions in the concentration range of 30ppm approx 1000ppm. The drag reduction ratio for laminar flow was about 11 approx 15