Similarity laws for turbulent flow of dilute solutions of drag-reducing polymers
Velocity similarity laws, based on a 4-layer, mean-velocity-profile model are deduced for turbulent boundary layers with dilute polymer solution by means of pipe-flow experiments. Measured drag reduction is studied in 3 domains: undersaturated, optimal, and oversaturated. Drag reduction increases with increasing concentration in the undersaturated domain where the 4-layer profile exists in the boundary layer. The boundary between the 2 domains gives optimal drag reduction; it is determined by the polymer type and concentration and by a Reynolds number based on shear velocity and boundary-layer thickness. The effects of solvent temperature, pipe diameter, polymer type and concentration, and wall shear stress on the measured drag reduction have been investigated.
- Research Organization:
- Department of the Navy, Washington, DC (USA)
- OSTI ID:
- 6512883
- Report Number(s):
- NSRDC-4096
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BENCH-SCALE EXPERIMENTS
BOUNDARY LAYERS
CONTROL
DRAG
FLOW RATE
FLUID FLOW
FLUIDS
LAYERS
MATHEMATICAL MODELS
PIPES
POLYMERS
RESERVOIR FLUIDS
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
SHEAR
STRESSES
TEMPERATURE DEPENDENCE
TURBULENT FLOW