The influence of surfactant additives on friction losses in the turbulent flow

In this paper, the measurement results of rheological behaviour of the surfactant solutions have been presented. The influence of pipe diameter and non-Newtonian behaviour index of the surfactant solutions on drag reduction phenomena were investigated. The results are presented in various, dimensionless co-ordinate systems. The influence of the Reynolds number definition on the shape and the position of the friction factor curve has been emphasised. The phenomena of drag reductions caused by high molecular polymers and surfactants have been compared.