scholarly journals Drag reduction behavior of hydrolyzed polyacrylamide/xanthan gum mixed polymer solutions

2017 ◽  
Vol 14 (2) ◽  
pp. 412-423 ◽  
Author(s):  
Mehdi Habibpour ◽  
Peter E. Clark
Keyword(s):  
Drag Reduction ◽  
Xanthan Gum ◽  
Polymer Solutions ◽  
Reduction Behavior ◽  
Hydrolyzed Polyacrylamide

scholarly journals Ionic Strength and Drag Reduction of Polymers in Straight Pipes – An Experimental Investigation

2021 ◽  
Vol 10 (2) ◽  
pp. 23
Author(s):  
Ahmed Kamel
Keyword(s):  
Ionic Strength ◽  
Drag Reduction ◽  
Polymer Solutions ◽  
Salt Content ◽  
Small Scale ◽  
Flow Loop ◽  
Reduction Behavior ◽  
Reduced Salt ◽  
Reduction Characteristics ◽  
The Relationship

Previous work has tied the drag reduction properties of polymer solutions to type and concentration of salts, rather than its ionic strength, although it is a more extensive parameter to investigate the effects of salt contents on fluids behavior. The current study aims at investigating the relationship between ionic strength and drag reduction characteristics of polymer solutions when flowing in straight tubing. Nalco ASP-700 and ASP-820, two common anionic AMPS copolymers, are examined with various salts (2% KCl, 4% KCl, and synthetic seawater). Flow tests were conducted using a small-scale flow loop that includes a straight tubing with an outside diameter of 1.27 cm and a length of 4.57 m. It has been found that drag reduction performance of polymer solutions is well correlated with ionic strength, rather than salt type and/or concentration. With high ionic strength, lower drag reduction is noticed despite of the reduced salt concentration. Nevertheless, at higher Reynolds number, the effects of ionic strength minimizes. Both polymer solutions exhibit effective drag reduction characteristics and their behavior is greatly affected by polymer type, shear rate, and salt content. Correlations, with acceptable confidence level, between drag reduction ratio and solutions ionic strength are proposed. The correlations are strongly recommended to investigate the effects of salt types and/or concentrations, represented by its ionic strength on drag reduction behavior of polymer solutions in straight tubing.

On the mechanism of drag reduction in dilute polymer solutions

1996 ◽  
Vol 55 (4) ◽  
pp. 289-295 ◽  
Author(s):  
K. Hoyer ◽  
A. Gyr ◽  
A. Tsinober
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Dilute Polymer Solutions

Drag Reduction of Polymer Solutions in a Pipe With a Highly Water-Repellent Wall

1999 ◽  
Author(s):  
Keizo Watanabe ◽  
Hiroshi Udagawa
Keyword(s):  
Pressure Drop ◽  
Laminar Flow ◽  
Drag Reduction ◽  
Polymer Solutions ◽  
Tap Water ◽  
Acrylic Resin ◽  
Water Repellent ◽  
Number Range ◽  
Surfactant Solutions ◽  
Laminar And Turbulent Flow

Abstract By applying a highly water-repellent wall pipe in the drag reduction of polymer solutions, a flow system in which drag reduction is obtained in both laminar and turbulent flow ranges has been realized. Experiments were carried out to measure the pressure drop in pipes with a highly water-repellent wall and an acrylic resin wall by means of a pressure transducer. The diameter of the pipe was 6mm. The polymer solutions tested were PE015 aqueous solutions in the concentration range of 30ppm∼1000ppm. The drag reduction ratio for laminar flow was about 11∼15%. To understand this effect, the pressure drop was measured by using surfactant solutions and degassed water, and by pressurizing tap water in the pipeline. It was shown that the laminar drag reduction does not occur in the case of surfactant solutions although degassed water and pressurizing tap water in the pipeline have no effect on the reduction. In the laminar flow range, the friction factor of a power-law fluid with fluid slip was analyzed by applying the modified boundary condition on fluid slip at the pipe wall, and the analytical results agree with the experimental results in the low Reynolds number range.

scholarly journals Comparative assessment of drag reduction efficiencies of polymer solutions and surfactants at low temperatures

2019 ◽  
Vol 696 ◽  
pp. 012004 ◽  
Author(s):  
E S Kashlach ◽  
E M Berezina ◽  
A S Smirnova ◽  
I A Berezina ◽  
V N Manzhai ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Low Temperatures ◽  
Polymer Solutions ◽  
Comparative Assessment
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