Roles of drag reducing polymers in single- and multi-phase flows

Abubakar, Abdulkareem; Al-Wahaibi, Talal; Al-Wahaibi, Yahya; Al-Hashmi, A.R.; Al-Ajmi, A.

doi:10.1016/j.cherd.2014.02.031

Cited by 102 publications

(61 citation statements)

References 132 publications

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“…This flow regime with a sufficiently high Reynolds number is commonly called turbulent flow [1] and is characterized by a less orderly flow phase in which the eddy currents of the fluid elements can result in chaotic lateral mixing [2]. For turbulent flow in pipelines, as well as in open and external flow, the friction can be reduced by introducing a minor quantity of a flexible, linear polymer with a high molecular weight into the flow [3]. This behavior is termed the polymer-induced turbulent drag reduction (DR) effect [4,5] which is an active friction reduction mechanism compared to the prevailing passive friction reduction.…”

Section: Introductionmentioning

confidence: 99%

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

2017

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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.

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Section: Introductionmentioning

confidence: 99%

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

2017

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“…Parameters influencing the performances of drag reducing polymers include flow rate, injection point, channel size, geometry, surface roughness, molecular weight, chain flexibility, structure, concentration, solvent, salt content, pH, and temperature [12][13][14][15][16]. Generally, DR increases with increasing polymer concentration, polymer molecular weight, Reynolds number, and flow rate.…”

Section: Polymer-induced Drmentioning

confidence: 96%

Reviews on drag reducing polymers

Tiong

Perumal

2015

Korean J. Chem. Eng.

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Polymers are effective drag reducers owing to their ability to suppress the formation of turbulent eddies at low concentrations. Existing drag reduction methods can be generally classified into additive and non-additive techniques. The polymer additive based method is categorized under additive techniques. Other drag reducing additives are fibers and surfactants. Non-additive techniques are associated with the applications of different types of surfaces: riblets, dimples, oscillating walls, compliant surfaces and microbubbles. This review focuses on experimental and computational fluid dynamics (CFD) modeling studies on polymer-induced drag reduction in turbulent regimes. Other drag reduction methods are briefly addressed and compared to polymer-induced drag reduction. This paper also reports on the effects of polymer additives on the heat transfer performances in laminar regime. Knowledge gaps and potential research areas are identified. It is envisaged that polymer additives may be a promising solution in addressing the current limitations of nanofluid heat transfer applications.

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“…The use of diverse polymers such as DRAs has been reported previously (Abubakar et al 2014;AlSarkhi 2012;Matras and Kopiczak 2015;Edomwonyi-Outu, Chinaud and Angeli 2015;Hong et al 2015;Iaccarino et al 2010;Resende et al 2011) and surfactants (Drzazga et al 2013;Li et al 2008;Różański 2011;Yu and Kawaguchi 2006;Tuan Mizunuma 2013;Qi et al 2011) depending upon the polarities and different behaviors in a turbulent flow (Tarn and Pamme 2014), while the impact of other colloidal suspensions, such as nanofluids, in reducing the pressure drop has not been widely studied. The dispersion quality of the nanoparticles in the base fluid and the stability of the suspension play a crucial role in most applications of practical interest (Rivet et al 2011;Xie et al 2003;Choi et al 2007;Ganguly et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Drag Reduction Properties of Nanofluids in Microchannels

Abdulbari

Ming

2015

Jou. Eng. Res.

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An experimental investigation of the drag reduction (DR) individualities in different sized micro channels was carried out with nanopowder additives (NAs) (bismuth(III) oxide, iron(II/III) oxide, silica, and titanium(IV) oxide) water suspensions/fluids. The primary objective was to evaluate the effects of various concentrations of NAs with different microchannel sizes (50, 100, and 200 µm) on the pressure drop of a system in a single phase. A critical concentration was observed with all the NAs, above which increasing the concentration was not effective. Based on the experimental results, the optimum DR percentages were calculated. The optimum percentages were found to be as follows: bismuth III oxides: ~65% DR, 200 ppm and a microchannel size of 100 µm; iron II/III oxides: ~57% DR, 300 ppm, and a microchannel size of 50 µm; titanium IV oxides: ~57% DR, 200 ppm, and a microchannel size of 50 µm, and silica: 55% DR, 200 ppm, and a microchannel size of 50 µm.

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Roles of drag reducing polymers in single- and multi-phase flows

Cited by 102 publications

References 132 publications

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

Applications of Water-Soluble Polymers in Turbulent Drag Reduction

Reviews on drag reducing polymers

Drag Reduction Properties of Nanofluids in Microchannels

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