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

Pereira, Anselmo Soeiro; Andrade, Rafhael M.; Soares, Edson J.

doi:10.1016/j.jnnfm.2013.09.008

Cited by 102 publications

(78 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the drag reduction achieved with rigid chain XG fell abruptly in the first step and remained constant, which is different from the cases with PEO and PAAM. Similarly, Pereira et al [61] compared the drag reduction efficiency of PEO, PAAM, and XG over time by using a rotating cylindrical doublegap device. They also found that there was no decrease in the drag reduction at a high PAAM concentration, which suggested that the PAAM chain is mechanically stronger than that of PEO.…”

Section: Polyacrylamidementioning

confidence: 99%

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

2017

View full text Add to dashboard Cite

Water-soluble polymers with high molecular weights are known to decrease the frictional drag in turbulent flow very effectively at concentrations of tens or hundreds of ppm. This drag reduction efficiency of water-soluble polymers is well known to be closely associated with the flow conditions and rheological, physical, and/or chemical characteristics of the polymers added. Among the many promising polymers introduced in the past several decades, this review focuses on recent progress in the drag reduction capability of various water-soluble macromolecules in turbulent flow including both synthetic and natural polymers such as poly(ethylene oxide), poly(acrylic acid), polyacrylamide, poly(N-vinyl formamide), gums, and DNA. The polymeric species, experimental parameters, and numerical analysis of these water-soluble polymers in turbulent drag reduction are highlighted, along with several existing and potential applications. The proposed drag reduction mechanisms are also discussed based on recent experimental and numerical researches. This article will be helpful to the readers to understand better the complex behaviors of a turbulent flow with various water-soluble polymeric additives regarding experimental conditions, drag reduction mechanisms, and related applications.

show abstract

Section: Polyacrylamidementioning

confidence: 99%

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

2017

View full text Add to dashboard Cite

show abstract

“…It has an open-ended variant that can be mounted into the wall of a vessel container [7,[16][17][18][19]. Spindle is mounted in a chamber through which the liquid of interest flows, the schematic arrangement is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Exploring Viscoelastic Characteristics of Polymer-Water Solutions by Viscometric Analysis

Devrani¹,

Sharma²,

Rajesh³

et al. 2017

Asian J. Chem.

View full text Add to dashboard Cite

Addition of small concentrations of certain high molecular weight polymers to flowing fluids can drastically reduce the turbulent friction. The mechanism is caused by the interaction of the elongated polymer molecule chains and the solvent molecules. The elongated structure of polymer acts as an eddy stress absorber and in turns ensures overall drag reduction between fluid layers. This can also be stated as the development of viscoelastic nature in the subject fluid. The present study compares the effects of the addition of two polymers namely polyacrylamide (PAM) and polyethylene oxide (PEO) in water, a Newtonian fluid. An experimental study using a viscometer is analyzed to showcase the viscoelastic nature developed by water on addition of polymers over a range of ppm concentrations. The results are in agreement with data reported in literature that viscoelastic nature is triggered on addition of these polymers.

show abstract

“…The concept, otherwise referred to as drag reduction. As a result of this, many authors have contributed significantly to the study of drag reduction [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 96%

“…Among these DRAs, Polymers, as discovered by Toms [1] have been the greatest explored and investigated. Nevertheless, they are prone to the challenge of mechanical degradation, especially under the influence of shear stress or temperature increase, which invariably reduce their efficiency [7]. Another set of material are the surfactants which have been investigated by many authors [8-11.…”

Section: Introductionmentioning

confidence: 99%