Diffusion of drag-reducing polymer solutions within a rough-walled turbulent boundary layer

2010 ◽  
Vol 22 (4) ◽  
pp. 045102 ◽  
Author(s):  
Brian R. Elbing ◽  
David R. Dowling ◽  
Marc Perlin ◽  
Steven L. Ceccio
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Polymer Solutions ◽  
Drag Reducing Polymer

scholarly journals Modification of turbulent boundary layer coherent structures with drag reducing polymer solution

2020 ◽  
Vol 32 (1) ◽  
pp. 015107 ◽  
Author(s):  
Yasaman Farsiani ◽  
Zeeshan Saeed ◽  
Balaji Jayaraman ◽  
Brian R. Elbing
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Polymer Solution ◽  
Coherent Structures ◽  
Drag Reducing Polymer

The Torque and Turbulent Boundary Layer of Rotating Disks with Smooth and Rough Surfaces, and in Drag-Reducing Polymer Solutions

1973 ◽  
Vol 17 (04) ◽  
pp. 181-195
Author(s):  
Paul S. Granville
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Polymer Solutions ◽  
Rough Surfaces ◽  
Three Dimensional ◽  
Rotating Disks ◽  
Dimensional Boundary ◽  
Maximum Drag Reduction ◽  
Drag Reducing Polymer ◽  
Unbounded Fluid

The resisting torque of disks rotating in an unbounded fluid is analyzed on the basis of three-dimensional boundary-layer theory. Smooth and rough surfaces in ordinary fluids and in drag-reducing polymer solutions are considered. A general logarithmic relation is derived for the torque as a function of Reynolds number for arbitrary roughness and arbitrary drag reduction. Special formulas are obtained for smooth surfaces, fully rough surfaces, polymer solutions with a linear logarithmic drag-reduction characterization, and polymer solutions with maximum drag reduction. Relations are also obtained for boundary-layer parameters such as thickness and wall shearing stress. The computed results are in excellent agreement with experimental data available in the literature.

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