Pressure drop in aqueous surfactant solution flow through pipes in SIS structure degradation zone
Dugonik, Marjeta ; Goričanec, Darko ; Krope, Jurij
The paper describes chemical and rheologic properties of solutions of polymer additives and cationic surfactants while they flow though pipes in a laminar and turbulent zone and their influence on ...drag reduction. Surface active additives or aqueous solutions of surfactants form rod-like micelles, associated into an intermolecular SIS structure that absorbs the turbulence energy at the passage through a pipe, thus influencing the reduction in pressure drop or drag reduction. The influence of the velocity of aqueous solution of surface active additives is analysed in pipes in the Re number range, where high shear stress leads to a degradation of the surfactant intermolecular SIS structure and the drag reduction effect disappears. The pressure drop and drag reduction rate diagrams as functions of aqueous surfactant solution flow velocity and Re number are based on computer calculations.
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