Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Drag Reduction by Additives in Curved Pipes for Single-Phase Liquid and Two-Phase Flows: A Review

Version 1 : Received: 2 January 2020 / Approved: 4 January 2020 / Online: 4 January 2020 (06:24:32 CET)

A peer-reviewed article of this Preprint also exists.

Ayegba, PO, Edomwonyi‐Otu, LC, Yusuf, N, Abubakar, A. A review of drag reduction by additives in curved pipes for single‐phase liquid and two‐phase flows. Engineering Reports. 2020;e12294. https://doi.org/10.1002/eng2.12294 Ayegba, PO, Edomwonyi‐Otu, LC, Yusuf, N, Abubakar, A. A review of drag reduction by additives in curved pipes for single‐phase liquid and two‐phase flows. Engineering Reports. 2020;e12294. https://doi.org/10.1002/eng2.12294

Journal reference: Engineering Reports 2020, 2020, e12294
DOI: 10.1002/eng2.12294

Abstract

A review of influence of drag-reducing agents on curved pipe flows is presented in this work. In addition, this review outlined proposed mechanism, friction factor and fluid flux models for drag-reducing agents in curved pipe flows. Our finding reveals that drag reduction by additives in curved pipes is quite significant but generally lower than the corresponding drag reduction in straight pipes. It decreases with increase in curvature ratio and more pronounced in the transition and turbulent flow regimes. Drag reduction strongly depends on the polymers and surfactants’ concentrations as well as the bubble fraction of micro-bubbles. It is also reported that drag reduction in curved pipes depends on temperature and existence of dissolved salts in the fluids. Maximum drag reduction asymptote differed between straight and curved pipes and between polymer and surfactant. No definite conclusion could be drawn as regards drag reduction for two-phase flow in curved pipes due to the limited studies in this area. Many questions such as the mechanism of drag reduction in curved pipes and how drag-reducing agents interact with secondary flows still remained unanswered. Hence, some research gaps have been identified with recommendations for areas of future researches.

Subject Areas

drag reduction; drag reducing agents; curved pipes; single phase flow; two phase flows

Comments (1)

Comment 1
Received: 27 October 2020
Commenter: Lawrence Edomwonyi-Otu
The commenter has declared there is no conflict of interests.
Comment: Excellent piece of work. Product of dogged determination to push a vital information out to the scientific community. Engineering Reports made all the difference. The topic was changed to "A review of drag reduction by additives in curved pipes for single‐phase liquid and two‐phase flows" in line with Reviewers recommendation.
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