Abstract
We analyze the polymer scission of a flexible polymer (polyethylene oxide) in a turbulent flow in pipelines, including abrupt contractions. The role played by these local occurrences is studied for an extensive range of concentrations and molecular weight over time (passes through our system). We pointed that the final value of the drag reduction parameter (DR) is independent of the initial value of molecular weight. This behavior is different for flows in straight tubes in the absence of local occurrences. We propose a model for DR as a function of concentration, molecular weight, contraction rate, and the number of passes through the system. We also showed that the fall of DR is linearly dependent on the molecular weight decrease.
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