Degradation effects of dilute polymer solutions on turbulent drag reduction in pipe flows

1995 ◽  
Vol 55 (1) ◽  
pp. 63-82 ◽  
Author(s):  
J. M. J. Toonder ◽  
A. A. Draad ◽  
G. D. C. Kuiken ◽  
F. T. M. Nieuwstadt
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Turbulent Drag Reduction ◽  
Pipe Flows ◽  
Dilute Polymer Solutions ◽  
Turbulent Drag

scholarly journals Saturation of turbulent drag reduction in dilute polymer solutions

2004 ◽  
Vol 68 (6) ◽  
pp. 825-831 ◽  
Author(s):  
R Benzi ◽  
V. S L'vov ◽  
I Procaccia ◽  
V Tiberkevich
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Turbulent Drag Reduction ◽  
Dilute Polymer Solutions ◽  
Turbulent Drag

scholarly journals Polymer turbulence with Reynolds and Riemann

2018 ◽  
Vol 848 ◽  
pp. 1-4 ◽  
Author(s):  
Michael D. Graham
Keyword(s):  
Differential Geometry ◽  
Drag Reduction ◽  
Continuum Mechanics ◽  
Polymer Solutions ◽  
Complex Fluids ◽  
Computational Results ◽  
Turbulent Drag Reduction ◽  
New Approach ◽  
Turbulent Drag ◽  
Conformation Tensor

Models of flowing complex fluids such as polymer solutions often use a conformation tensor that reflects the state of the fluid microstructure. In polymer solutions, this quantity measures the orientation and stretching of the molecules, and reflects the fact that the squared length of a polymer molecule must be positive. By exploiting results from differential geometry and continuum mechanics, Hameduddin et al. (J. Fluid Mech., vol. 842, 2018, pp. 395–427) introduce a new approach for analysing the conformation tensor that respects this positivity constraint. With this approach, they present computational results for turbulent flow of a polymer solution that exhibits turbulent drag reduction, showing that the new measures of polymer stretching afforded by their approach lend insights not available in traditional methods.

Time-series and extended Karhunen-Loève analysis of turbulent drag reduction in polymer solutions

AIChE Journal ◽  
2014 ◽  
Vol 60 (4) ◽  
pp. 1460-1475 ◽  
Author(s):  
Sung-Ning Wang ◽  
Michael D. Graham ◽  
Friedemann J. Hahn ◽  
Li Xi
Keyword(s):  
Time Series ◽  
Drag Reduction ◽  
Polymer Solutions ◽  
Turbulent Drag Reduction ◽  
Turbulent Drag

scholarly journals Fibre-induced drag reduction

2008 ◽  
Vol 602 ◽  
pp. 209-218 ◽  
Author(s):  
J. J. J. GILLISSEN ◽  
B. J. BOERSMA ◽  
P. H. MORTENSEN ◽  
H. I. ANDERSSON
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Drag Reduction ◽  
Elastic Layer ◽  
Turbulent Drag Reduction ◽  
Rigid Polymer ◽  
Fibre Concentration ◽  
Induced Drag ◽  
Turbulent Drag

We use direct numerical simulation to study turbulent drag reduction by rigid polymer additives, referred to as fibres. The simulations agree with experimental data from the literature in terms of friction factor dependence on Reynolds number and fibre concentration. An expression for drag reduction is derived by adopting the concept of the elastic layer.

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