An experimental study of the drag reduction pipe flows with the addition of natural macromolecules

Abstract

We studied on the drag reduction of CNF (cellulose nano fiber), that is a natural polymer, on the friction in a pipe flow. The fibers of CNF are characterized by the fact that into density in about one-fifth of iron while the strength is five times that of iron. Therefore, it attracts a lot of attention in material industries.

It is known that adding polymers to water in the pipe flow significantly reduces the coefficient of pipe friction as compared with water all. If you can understand the drag reduction of pipe friction resistance, one is understood can save energy. In this study, the pressure difference and the flow velocity of the water with CNF were measured, and the relationship between them was investigated to confirm the effect of CNF on reducing the pipe friction resistance.