Scission-induced bounds on maximum polymer drag reduction in turbulent flow
β Scribed by Vanapalli, Siva A.; Islam, Mohammad T.; Solomon, Michael J.
- Book ID
- 121799387
- Publisher
- American Institute of Physics
- Year
- 2005
- Tongue
- English
- Weight
- 385 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1070-6631
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
In this study, polyethylene oxides were used as a drag reducing additive. The effect of the concentration and molecular weight of the polymer on the level of drag reduction was examined using, 4 molecular weights (2 Γ 10 5 , 4Γ10 5 , 9Γ10 5 and, 4 Γ 10 6 ) and 4 concentrations (1, 5, 10 and, 20 wppm
Secondary flows are always present when a turbulent Newtonian fluid flows through a square duct. We show that they are suppressed in surfactant solutions at maximum drag reduction. This result confirms the one-dimensional behaviour of such flows, which is caused by the alignment of the micelles.