Scale effects in polymer solution pipe flow

Hoyt, J. W.; Sellin, R. H. J.

doi:10.1007/bf00195598

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…In such case, the similarity of velocity profiles is broken because of the growing extension of the viscous sublayer (see Ref. [12]). In Bewersdorff's data base [13], pipe diameters are 20-30 times smaller than our pipe and this might make the scaling inaccurate [12].…”

Section: Scale Up Of Drag Reductionmentioning

confidence: 99%

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Turbulent Drag Reduction by Biopolymers in Large Scale Pipes

Campolo

Simeoni

Lapasin

et al. 2015

Journal of Fluids Engineering

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In this work, we describe drag reduction experiments performed in a large diameter pipe (i.d. 100mm) using a semirigid biopolymer Xanthan Gum (XG). The objective is to build a self-consistent data base which can be used for validation purposes. To aim this, we ran a series of tests measuring friction factor at different XG concentrations (0.01, 0.05, 0.075, 0.1, and 0.2% w/w XG) and at different values of Reynolds number (from 758 to 297,000). For each concentration, we obtain also the rheological characterization of the test fluid. Our data is in excellent agreement with data collected in a different industrial scale test rig. The data is used to validate design equations available from the literature. Our data compare well with data gathered in small scale rigs and scaled up using empirically based design equations and with data collected for pipes having other than round cross section. Our data confirm the validity of a design equation inferred from direct nu- merical simulation (DNS) which was recently proposed to predict the friction factor. We show that scaling procedures based on this last equation can assist the design of piping systems in which polymer drag reduction can be exploited in a cost effective way

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Section: Scale Up Of Drag Reductionmentioning

confidence: 99%

“…[11]. We evaluate and discuss the predictive ability of one empirical scaling [12] based on drag reduction data collected in laboratory scale test rigs (pipe diameter equal to 3, 5, and 6 mm, in Ref. [13]; 10, 25, and 50 mm in Ref.…”

Section: Introductionmentioning

confidence: 99%

Turbulent Drag Reduction by Biopolymers in Large Scale Pipes

Campolo

Simeoni

Lapasin

et al. 2015

Journal of Fluids Engineering

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show abstract

“…Hoyt and Sellin [18] suggested that the reason for this limited success is the relatively stronger effect of the laminar sublayer in small tubes than in larger tubes. They suggested that, in general, only tubes with diameters larger than 10 mm can be scaled adequately by almost all proposed methods.…”

Section: Introductionmentioning

confidence: 99%

An improved diameter scaling correlation for turbulent flow of drag-reducing polymer solutions

Gasljevic¹,

Aguilar²,

Matthys³

1999

Journal of Non-Newtonian Fluid Mechanics

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“…An additional advantage is that there is no need to build a large‐scale flow device or use a high flow velocity by this new correlation. In most previous correlations for the drag reduction estimation, the friction factor was a function of Reynolds number . In the Reynolds number definition, the diameter and velocity are the numerators.…”

Section: Discussionmentioning

confidence: 99%

Experimental correlation for pipe flow drag reduction using relaxation time of linear flexible polymers in a dilute solution

et al. 2019

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In this study, we investigate the drag reduction property of a linear flexible polymer, PEO (polyethylene oxide) in a fully turbulent pipe flow. The aim of this study is to develop a correlation to predict the drag reduction using the Weissenberg number, a dimensionless number related to the relaxation time of the polymer and the polymer concentration in dilute solutions. The physical meaning of the relaxation time of polymers and overlap concentration between the dilute and semi-dilute polymer solution are clarified. A higher polymer concentration, Reynolds number, and Weissenberg number lead to an increasing drag reduction. A semi-empirical correlation to predict the drag reduction with two dimensionless variables mentioned above is established and can predict the experimental data in this work and other previous works well. Previous correlations that use Reynolds number often require high flow velocity or large pipes in the experimental setup to predict drag reduction in large-scale industrial applications, which involves extra cost and potential safety issues. The current new correlation method uses relatively low velocities to avoid the problems mentioned above. K E Y W O R D Sdrag reduction, pipe flow, polymer, relaxation time, Weissenberg number

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Scale effects in polymer solution pipe flow

Cited by 13 publications

References 7 publications

Turbulent Drag Reduction by Biopolymers in Large Scale Pipes

Turbulent Drag Reduction by Biopolymers in Large Scale Pipes

An improved diameter scaling correlation for turbulent flow of drag-reducing polymer solutions

Experimental correlation for pipe flow drag reduction using relaxation time of linear flexible polymers in a dilute solution

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