“Negative roughness” and polymer drag reduction

1991 ◽  
Vol 11-11 (2-3) ◽  
pp. 142-146 ◽  
Author(s):  
J. W. Hoyt
Keyword(s):  
Drag Reduction ◽  
Polymer Drag Reduction

High Reynolds Number Micro-Bubble and Polymer Drag Reduction Experiments

2008 ◽  
Author(s):  
Steven L. Ceccio ◽  
David R. Dowling ◽  
Marc Perlin ◽  
Michael Solomon
Keyword(s):  
Reynolds Number ◽  
Drag Reduction ◽  
High Reynolds Number ◽  
Polymer Drag Reduction ◽  
Micro Bubble ◽  
High Reynolds

Comparison of Turbulent Boundary Layer Profiles Modified With Injection or Uniform Concentration of Drag-Reducing Polymer Solution

2020 ◽  
Author(s):  
Brian R. Elbing
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Drag Reduction ◽  
Polymer Concentration ◽  
Weissenberg Number ◽  
Polymer Injection ◽  
Von Karman ◽  
Polymer Properties ◽  
Polymer Drag Reduction ◽  
Von Kármán

Abstract The current study explores the influence of polymer drag reduction on the near-wall velocity distribution in a turbulent boundary layer. The classical view is that the polymers modify the intercept constant within the log-region without impacting the von Kármán coefficient, which results in the log-region being unaltered though shifted outward from the wall. However, it has been recently shown that this is not accurate, especially at high drag reduction (> 40%). Past work examining the von Kármán coefficient and intercept constant has shown that polymer properties must impact the deviations, but without any quantification of the dependence. This work reviews the literature to make estimates of the local polymer properties and then demonstrates that the scatter at HDR can be attributed to variations in the Weissenberg number. In addition, new polymer ocean results are incorporated and shown to be quite consistent with polymer injection results using the maximum polymer concentration to define the polymer properties.

scholarly journals FISH MUCUS:IN SITUMEASUREMENTS OF POLYMER DRAG REDUCTION

1981 ◽  
Vol 160 (3) ◽  
pp. 376-382 ◽  
Author(s):  
THOMAS L. DANIEL
Keyword(s):  
Drag Reduction ◽  
Polymer Drag Reduction

Relation of Polymer Drag Reduction to Structure and Molecular Weight (Keynote)

2003 ◽  
Author(s):  
Michael Vlachogiannis ◽  
Matthew Liberatore ◽  
Anthony J. McHugh ◽  
Thomas J. Hanratty
Keyword(s):  
Molecular Weight ◽  
Drag Reduction ◽  
Polymer Solution ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Polymer Drag Reduction ◽  
Hydrolyzed Polyacrylamide

The influence of molecular weight distribution on polymer drag reduction was studied for solutions of partially hydrolyzed polyacrylamide by analyzing the solution over a period of time during which the polymer was degrading. No relation was observed between the effectiveness of this polymer solution and molecular weight.

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