Effect of Chemical Structure on Aggregate Properties and Drag Reduction Behaviors of Quaternary Ammonium Salt Cationic Surfactant Solutions

摘要

Rod-shaped micelles, which are formed in the aqueous solution of NaSal /CTAB system, have been recognized to dramatically reduce wall shear stress in a turbulent pipe flow. In the present study, we report on the aggregate properties and drag reduction behaviors of quaternary ammonium salt cationic surfactant solutions in terms of 1) alkyl chain length, 2) number of hydroxyethyl group and 3) molar ratio of [NaSal]/[Cationics]. It was found that the formation of SIS (shear-induced structure) played an important role on DR effect.