Drag reduction by additives in curved pipes for single phase liquid and
two phase flows: A review
- Paul Ayegba,
- LAWRENCE EDOMWONYI-OTU,
- Nurudeen Yusuf,
- Abdulkareem Abubakar
LAWRENCE EDOMWONYI-OTU
Delta State University - Oleh Campus
Author ProfileAbdulkareem Abubakar
Ahmadu Bello University Faculty of Engineering
Author ProfileAbstract
A review of investigations on the effect of drag-reducing agents in
curved pipe flows is presented in this work. Proposed mechanisms of drag
reduction, as well as factors that influence their effectiveness also
received attention. In addition, this review outlined proposed friction
factor and fluid flux models for flow of drag-reducing agents in curved
pipes. It was shown in this report that significant drag reduction in
curved pipes can be achieved using drag-reducing agents. Drag reduction
by additives in curved pipes are generally lower than the corresponding
drag reduction in straight pipes. It decreases with increase in
curvature ratio and is more pronounced in the transition and turbulent
flow regimes. Drag reduction depends strongly on the concentration of
polymers and surfactants as well as the bubble fraction of
micro-bubbles. It is also reported that drag reduction in curved pipes
depends on other factors such as temperature and presence of dissolved
salts. Maximum drag reduction asymptote differed between straight and
curved pipes and between polymer and surfactant. Due to the limited
studies in the area of drag reduction for gas-liquid flow in curved
pipes no definite conclusion could be drawn on the effect of
drag-reducing agents on such flows. A number of questions remain such as
the mechanism of drag reduction in curved pipes and how drag-reducing
agents interact with secondary flows. Hence, some research gaps have
been identified with recommendations for areas of future researches.29 Jan 2020Submitted to Engineering Reports 30 Jan 2020Submission Checks Completed
30 Jan 2020Assigned to Editor
18 Feb 2020Reviewer(s) Assigned
23 May 2020Editorial Decision: Reject & Resub
06 Jul 20201st Revision Received
07 Jul 2020Submission Checks Completed
07 Jul 2020Assigned to Editor
24 Jul 2020Reviewer(s) Assigned
21 Aug 2020Editorial Decision: Accept