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Turbulent structure in a channel flow with polymer injection at the wall

Published online by Cambridge University Press:  26 April 2006

D. T. Walker  and
W. G. Tiederman
D. T. Walker
Affiliation:
Department of Naval Architecture and Marine Engineering, The University of Michigan, Ann Arbor, MI 48109-2145, USA
W. G. Tiederman
Affiliation:
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
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Abstract

Two-component laser velocimeter measurements in a fully developed turbulent water channel flow with polymer injection were used to examine the effect of polymer injection on the Reynolds stresses and the production terms in the Reynolds stress transport equations. These measurements show that while the root-mean-square (r.m.s.) fluctuation level of the streamwise velocity was increased, the r.m.s. of the wall-normal velocity and the Reynolds shear stress were reduced. The decrease in the Reynolds shear stress resulted from altered contributions from the quadrants of the (u,v)-plane. Although the Reynolds shear stress decreased, the magnitude of the velocity fluctuation products which most contributed to that stress increased. Production of the streamwise Reynolds normal stress was decreased but production of the Reynolds shear stress was unchanged. This shows that the processes represented by pressure–strain correlation terms in the Reynolds stress transport equations may be directly affected by the polymer.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 218 , September 1990 , pp. 377 - 403
Copyright
© 1990 Cambridge University Press

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