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Study of the Reduction of Turbulent Drag by Photon Correlation Spectroscopy

Published online by Cambridge University Press:  25 February 2011

P. Tong ,
W. I. Goldburg  and
J. S. Huang
P. Tong
Affiliation:
Department of Physics, Oklahoma State University, Stillwater, OK 74078
W. I. Goldburg
Affiliation:
Department of Physics, University of Pittsburgh, Pittsburgh, PA 15260
J. S. Huang
Affiliation:
Exxon Research and Engineering Company, Annandale, NJ 08801
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Abstract

Turbulent drag reduction in a dilute polymer solution has been studied using the technique of photon-correlation homodyne spectroscopy to measure velocity differences in a concentric cylinder cell, in which the inner cylinder rotates. A large anisotropic suppression of turbulent velocity differences is found in the bulk region of the turbulent fluid. The suppression effect occurs at various length scales up to ∼ 1 mm, which is far beyond the Kolmogorov dissipation length ℓd (∼ 0.04 mm). The large-scale velocity fluctuations are suppressed, but their statistical properties remain unchanged. The small-scale fluctuations, on the other hand, are damped out much more strongly, resulting in a different functional form for the velocity density function. The latter observation is consistent with the notion that the polymer-turbulence interaction causes a truncation of the turbulent energy cascade at small scales.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 151
Copyright
Copyright © Materials Research Society 1992

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