Abstract
Polyethylene Oxide (PEO) is one of the most common drag reduction agents. However, its ability to reduce drag in turbulent flow decreases with the time due to the degradation of its molecules. Thus, the enhancement of its degradation resistance by the addition of Anionic surfactant is presented. The Polyethylene oxide (PEO) was used in different concentration ranges from 10 to 60 ppm and with addition of sodium dodecyl benzene sulfonate (SDBS) as the anionic surfactant with five concentrations between 100 to 500 ppm. The degradation measurements were done using rotating disk apparatus (RDA). The RDA results have shown a considerable improvement in the degradation resistance of PEO with the addition of surfactant to the polymer solution. The interaction between the polymer and the surfactant results in transferring the polymer chain from coil to straight-like body. Thus, enhance the polymer degradation resistant ability.
Highlights
The drag reduction was discovered by Toms in 1948, which is probably the effect produced by polymer addiction in fluids which has attracted most of the attention, due to its relevance for several applications
At higher concentrations of Polyethylene Oxide (PEO) the resulting improvement decreased at higher sodium dodecyl benzene sulfonate (SDBS) concentration i.e. 400 and 500 ppm. This due to the effect of internal repulsion extruded by the increase of the attached surfactant into the polymer solution which results in contrary effects
This improvement was noticed to increase with the increase in the surfactant concentration at low PEO concentration i.e. 10 and 20 ppm
Summary
The drag reduction was discovered by Toms in 1948, which is probably the effect produced by polymer addiction in fluids which has attracted most of the attention, due to its relevance for several applications. The shear force at the wall of the flow channel will degrade the polymer mechanically [6].This mechanical stress will break the linkage of polymer reduces its efficiency towards the solvent [7] To solve these major problems, there are three ways to enhance polymer stability and mechanical strength. Mohsenipour and Pal, investigated the effect of formation complex microstructure of a mixed non-ionic polymer PEO and anionic surfactant SDS, in a pipeline flow loop on drag confinement. They found that the mixture of polymer-surfactant as a drag reducer shows a considerable synergistic effect on drag reduction (lower friction factors) as compared with system has polymer or surfactant alone. The addition of SDBS to the polymer was investigated in term of the degradation resistance even at very low polymer concentrations and how can delay the mechanical degradation of polymer with time
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