Laser anemometer measurements of Reynolds stress in a turbulent channel flow with drag reducing polymer additives
作者:
W. W. Willmarth,
T. Wei,
C. O. Lee,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1987)
卷期:
Volume 30,
issue 4
页码: 933-935
ISSN:0031-9171
年代: 1987
DOI:10.1063/1.866278
出版商: AIP
数据来源: AIP
摘要:
Turbulence measurements with a high resolution laser Doppler anemometer in a channel flow with injection of a concentrated polyethylene oxide solution are reported. With polymer injection sufficient to yield a well mixed concentration of 10 ppm the total drag is reduced by 38%, but the sum of the Reynolds stress and the conventional molecular shear stress is only (2)/(3) of the force produced by the streamwise pressure gradient. Thus, the injected polymer solution has a significant effect on the turbulence and causes an additional retarding force equal to approximately (1)/(3) of the total drag.
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