The diameter effect in drag reduction
β Scribed by J. Vleggaar; W.R. Dammers; M. Tels
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 141 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0009-2509
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π SIMILAR VOLUMES
The effect of polymer concentration on drag reduction was studied experimentally with dilute distilled water solutions of a polyacrylamide and a polyethyleneoxide, molecular weights 4.7 and 1.3 x 1 OB respectively, in a 0~94.5 cm i.d. pipe. During drag reduction the polymer solutions obeyed friction
The existence of adsorbed-entangled layers at flow boundaries of dilute polymer solutions is demonstrated by observing chemical effects in wash-off kinetics for such layers and by monitoring polymer concentration build-up in a flow i&tared experiment. These layers are then "'anchored" by a novel, no