In order to develop the drag-reducing technology in turbulent water-transporting flow by environmental friendly surfactant additives to water,experimental investigation was carried out on the drag-reducing behavior,shear viscosity, and relaxation characteristics of shear stres of nonionic surfactant alkyl polyglucoside solution in a pipe,by a flow-drag test device driven by compressed air and a cone plate rheometer.The results showed that alkyl polyglucoside presents excellent drag-reducing ability, and when temperature and concentration increase, the critical Reynolds number with maximal drag-reducing rate increases.The shear viscosities are Newtonian at smaller shear-rates,and suddenly jump up at some critical shear rate,which is called as SIS (Shear-Induced Structure). Development and relaxation behavior of Shear stress is the same with water,which showed that the immediate causal connections is absent between SIS and viscoelastic effects.
