Abstract
Abstract - The main aim of this paper is to present a possibility to enhance the drag reduction effect in straight pipe flow by the simultaneous addition to the transported liquid of a small amount of high molecular weight polymers and surfactants. Qualitative analysis of the polymer-micellar additive influence on the shape and character of flow resistance curves has been performed. Also multicomponent polymer-micellar solution flow resistance curves were compared with appropriate single additive polymer or surfactant solution flow resistance curves. The experimental data shows that, for polymer-micellar solutions, the stable transitional zone between the laminar and the turbulent flow regions is extended toward higher values of the critical Reynolds numbers. Occurrence of the phenomenon can be explained by the flow laminarization caused by polymer-micellar aggregates. Existence of the third extended drag reduction zone in the turbulent range of flow has also been observed for the first time.
Highlights
Abnormal flow drag reduction by surfactant or polymer additives is intensively examined and described in the subject literature (Matras, 1984; Borostow, 2008; White and Mungal, 2008; Wang et al., 2011; Shu-Peng, 2012; Tamano et al, 2010;)
There is still strong debate on whether a single polymer molecule or clusters of polymer molecules are responsible for the drag reduction effect, experimental results clearly prove that even a dozen ppm of polymer concentration in the solvent induces an
The aim of this paper is to perform an analysis of the drag reduction efficiency induced by simultaneous addition to the solvent of both surfactants and high molecular weight polymer, comparing to the drag reduction effect obtained by addition of pure polymer or pure surfactant agents
Summary
Abnormal flow drag reduction by surfactant or polymer additives is intensively examined and described in the subject literature (Matras, 1984; Borostow, 2008; White and Mungal, 2008; Wang et al., 2011; Shu-Peng, 2012; Tamano et al, 2010;). This phenomenon allows a significant increase of flow rate without increasing power demand, or vice versa. There is still strong debate on whether a single polymer molecule or clusters of polymer molecules are responsible for the drag reduction effect, experimental results clearly prove that even a dozen ppm of polymer concentration in the solvent induces an
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