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The influence of polyvinylacetate additive in water on turbulent velocity field and drag reduction

✍ Scribed by A. Lodes; V. Macho

Publisher
Springer
Year
1989
Tongue
English
Weight
362 KB
Volume
7
Category
Article
ISSN
0723-4864

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✦ Synopsis

The effect of polymer concentration on drag reduction was studied experimentally with diluted water solutions of polyvinylacetate in a 2.4 cm I.D. pipe. The instantaneous local velocities of the velocity fields were measured by a one-channel differential laser-Doppler anemometer DISA Mark II, with forward scattering. Concentrations of water-polyvinylacetate over the range from 10 to 2,000 ppm were used. The drag reduction coefficient is proportional to the concentration and hydrolysis degree of the saponificated polyvinylacetate (PVAC) employed. A mechanical degradation in the turbulent shear flow was not observed.

List of symbols

a 1 a2 * A version of this paper was presented at the 9th National Symposium on the measurement of turbulence with laser Doppler and other anemometers, Bratislava, CSSR, 1986

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