Drag Reduction on Hydraulic Transport of Solids : Effects of Polymer and Fine Solid Particle Additives

Abstract

Experiments for drag reduction on the hydraulic transport of a solid have been carried out using polymer solutions and SiO₂ slurries. It is clear that the pressure loss of the case of polymer solutions decreases in the high mean velocity range by comparison with the case of water, and that of SiO₂ slurries decreases in the low mean velocity range. The drag coefficient of a solid in SiO₂ slurries has been obtained through the measurement of the terminal velocity using a ultrasonic transducer, and the experimental data of pressure loss of the circular and spiral tubes has been correlated with the experimental formula.