Influence of drag-reducing polymer on flow patterns, drag reduction and slip velocity ratio of oil–water flow in horizontal pipe

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

doi:10.1016/j.ijmultiphaseflow.2015.02.016

Cited by 42 publications

(24 citation statements)

References 14 publications

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“…This is the cause of the high increase in the frictional pressure gradients recorded at = 0.1 for = 0.4 m/s where such transition was observed. It should be noted all these trends are in agreement with our previous study for the horizontal oil-water flow (Abubakar et al, 2015).…”

Section: Comparison Between Flow Pattern Maps Without Drp At 0 0 and supporting

confidence: 93%

“…Although no sufficient reason was found to support this inconsistent or variable trend, the results of Lum et al (2006) A c c e p t e d M a n u s c r i p t 22 also be noted that the current results are similar to the previous results at 0 0 in terms of the trend against the variable parameters (Abubakar et al, 2015). This means that the drag reduction which decreases with the increase in the input oil volume fractions at the waterdominated flow regions suddenly increases substantially at phase inversion points ( Figure 12).…”

supporting

confidence: 68%

“…The full detailed descriptions of the experimental set-up and procedure, as well as the precautionary measures taken to ensure accurate results, can be found in our earlier published work in which the effect of the DRP on horizontal oil-water flow was investigated (Abubakar et al, 2015). The only difference is that the test section was positioned at -5 0 from horizontal for the downward inclined flow.…”

Section: Experimental Set-upmentioning

confidence: 99%

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Performance of a drag-reducing polymer in horizontal and downward-inclined oil–water flow

Abubakar

Al-Hashmi

Al-Wahaibi

et al. 2015

Chemical Engineering Research and Design

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Section: Comparison Between Flow Pattern Maps Without Drp At 0 0 and supporting

confidence: 93%

supporting

confidence: 68%

Section: Experimental Set-upmentioning

confidence: 99%

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Performance of a drag-reducing polymer in horizontal and downward-inclined oil–water flow

Abubakar

Al-Hashmi

Al-Wahaibi

et al. 2015

Chemical Engineering Research and Design

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“…DR by addition of drag‐reducing polymers, DRPs, to Newtonian fluid flows have been studied widely but an understanding of underlying mechanism of DR remains incomplete . Near‐wall vortices is a key component in the self‐sustaining mechanism of wall‐generated turbulence.…”

Section: Piv Investigations Of Drag‐reducing Flowsmentioning

confidence: 99%

“…DR by addition of drag-reducing polymers, DRPs, to Newtonian fluid flows have been studied widely but an understanding of underlying mechanism of DR remains incomplete. [92][93][94] Near-wall vortices is a key component in the self-sustaining mechanism of wall-generated turbulence. Therefore, the interaction and modification of turbulence structures near the wall is expected constitute an important component of the mechanism responsible for DR. 44,95,96 DRP-induced DR can be categorized into homogeneous and heterogeneous DR depending on distribution of the DRP in the flow media.…”

Section: Piv Investigations Of the Effect Of Drag-reducing Polymers Omentioning

confidence: 99%

Turbulence statistics and flow structure in fluid flow using particle image velocimetry technique: A review

Ayegba

Edomwonyi‐Otu

2020

Engineering Reports

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Particle image velocimetry (PIV) measurement technique provides an excellent opportunity for investigating instantaneous spatial structures which are not always possible with point measurements techniques like laser Doppler velocimetry. In this review, it was shown that PIV technique provides an effective means of visualizing important structures of Newtonian and drag‐reducing fluid flows. Such structures include large‐scale‐events that constitute an important portion of the Reynolds stress tensor; shear layers of drag‐reducing flows, which have been suggested to constitute the mechanism of drag reduction (DR); and near wall vortices/low speed streaks which constitute the mechanism of turbulence production. PIV investigations of turbulence statistics in Newtonian and drag‐reducing fluid flows were reviewed with the view of providing explanation to DR by additives. Results of turbulence statistics, for Newtonian fluid flow, showed that streamwise velocity fluctuations and turbulence intensity had peak values close to the wall, in a region of high mean velocity gradient, while radial fluctuating velocity and Reynolds stress tensor had peaks further from the wall and at approximately the same detachment from the wall. In single‐ and two‐phase flows in horizontal channels, the velocity profile of polymer solution, in the turbulent regime, show asymmetric behavior. This review highlighted important interfacial characteristics in gas‐liquid flows such as S‐shaped velocity profile as well as the turbulences statistics in each phase and across the interface region. Drag‐reducing agents (DRAs)‐imposed changes on turbulence statistics and flow structures were also examined. PIV studies of drag‐reducing flows showed that DRAs act to dampen wall‐normal‐, streamwise fluctuating velocity, and Reynolds stress tensor. The reduction in Reynolds stress tensor is higher than the reduction of both wall‐normal and streamwise velocity fluctuations and this discrepancy has been associated with the decorrelation of the component of fluctuating velocity. Furthermore, the addition of DRA produces a shift of the peak of wall‐normal velocity fluctuations further from the wall due to increased buffer layer thickness. DRAs do not only act to reduce drag but also to modify the flow structure. The major influence of DRAs on flow structures is seen in the reduced strength and population of vortices close to the wall, increased spacing between low‐speed streaks, reduced frequency of large‐scale events and reduced concentration of small eddies. Effect of DRAs on flow structures depends not only on the level of DR but also on the concentration and molecular weight. The effect of concentration is linked to the elastic properties of the DRA. The influence of DRA on oil‐water flows in similar to its effect on single phase water flow with regards to changes in near wall structures and turbulence statistics. A few research gaps and limitations of the PIV techniques were also highlighted.

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Contribution of Superhydrophobic Surfaces and Polymer Additives to Drag Reduction

2021

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Drag reduction has constantly received great attention due to its extensive range of applications in fluid transportation and vehicle industries. The vital role of two different additive and non‐additive techniques (polymer additives and superhydrophobic surfaces) to reduce the drag force experienced by underwater vehicles, fluid flow through pipes, ducts, open or closed channels, and other wall‐bounded laminar and turbulent flows is highlighted. Reducing the drag resistance can significantly enhance the performance of immersed vehicles and results in saving the energy consumed on a large scale. The progress in theoretical modeling, experimental and computational studies of both techniques are reviewed, together with the surface design, wettability, and influence of the roughness factor of superhydrophobic surfaces and the effect of polymer drag‐reducing agents for wall‐bounded flows and multiphase flows. General formulations, potential applications, and major issues involved in the aforementioned approaches are summarized.

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Influence of drag-reducing polymer on flow patterns, drag reduction and slip velocity ratio of oil–water flow in horizontal pipe

Cited by 42 publications

References 14 publications

Performance of a drag-reducing polymer in horizontal and downward-inclined oil–water flow

Performance of a drag-reducing polymer in horizontal and downward-inclined oil–water flow

Turbulence statistics and flow structure in fluid flow using particle image velocimetry technique: A review

Contribution of Superhydrophobic Surfaces and Polymer Additives to Drag Reduction

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