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Drag reduction induced by flexible and rigid molecules in a turbulent flow into a rotating cylindrical double gap device: Comparison between Poly (ethylene oxide), Polyacrylamide, and Xanthan Gum
Abstract Polymer-induced drag reducing flow has been investigated for over 60 years. One reason for this is that the drag reducers in flow systems have been successfully applied and represent a greatExpand
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Transient aspects of drag reducing plane Couette flows
Abstract The addition of a small amount of polymers of high molecular weight can lead to a decrease in the pressure drop in turbulent flows. Over the years, numerous studies have been conducted inExpand
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POLYMER DEGRADATION IN TURBULENT DRAG REDUCING FLOWS IN PIPES
The drag reduction by addition of high molecular additives has been investigated by a number of researchers since it was reported by Toms more than 60 years ago. One of the most significantExpand
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Polymer degradation of dilute solutions in turbulent drag reducing flows in a cylindrical double gap rheometer device
Abstract The drag reduction by high molecular weight polymer additives in a turbulent flow is an important phenomenon that has received the attention of a number of researchers. However, theExpand
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Loss of efficiency of polymeric drag reducers induced by high Reynolds number flows in tubes with imposed pressure
This paper studies the loss of efficiency of polymeric drag reducers induced by high Reynolds number flows in tubes. The overall pressure was fixed and the apparatus was built so as to minimize theExpand
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An objective perspective for classic flow classification criteria
Four classic criteria used to the classification of complex flows are discussed here. These criteria are useful to identify regions of the flow related to shear, elongation or rigid-body motion.Expand
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Drag increase at the very start of drag reducing flows in a rotating cylindrical double gap device
In this note we present some results concerning the time required for turbulent structures to achieve their steady state, called here the developing time. Notably, there is a drag increase at theExpand
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Statistics and tensor analysis of polymer coil–stretch mechanism in turbulent drag reducing channel flow
The polymer coil–stretch mechanism in turbulent drag reducing flows is analysed using direct numerical simulations of viscoelastic finitely extensible nonlinear elastic fluids with the PeterlinExpand
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