Frictional Resistance in Fiber Suspensions : 3rd Report, Frictional Resistance in Mixed Systems with Polymer Solutions

Abstract

Turbulent drag reduction in a mixed fiber-polymer system was observed both in a pipe flow and a flow on a rotating disk. Drag reducing rate in a mixed system was approximately the sum of each rate in separate system, though the effect of fiber additives is weakened a little by mixing with an increase in polymer concentration. In addition, we observed a phenomenon that transition to turbulence was delayed in a mixed system.