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WEAK MEAN TURBULENT FLOW OF DILUTE POLYMER SOLUTION

Alexander Liberzon
Institute of Hydromechanics and Water Resources Management, Swiss Federal Institute of Technology, ETH Honggerberg, CH 8093 Zurich, Switzerland

Michele Guala
Department of Civil Engineering University of Minnesota, Twin Cities 500 Pillsbury Dr. SE Minneapolis, Minnesota 55455

Wolfgang Kinzelbach
Institute of Hydromechanics and Water Resources Management, Swiss Federal Institute of Technology, ETH Honggerberg, CH 8093 Zurich, Switzerland

Beat Luthi
Risø National Laboratory, Frederiksborgvej 399, P.O. 49 DK-4000 Roskilde, Denmark

Arkady Tsinober
Department of Fluid Mechanics and Heat Transfer, School of Mechanical Engineering, Tel-Aviv University, Tel-Aviv, Israel; and Institute for Mathematical Sciences and Department of Aeronautics, Imperial College, London, United Kingdom

Abstrakt

We present an experimental, comparative study of the turbulent quantities of a weak mean turbulent flow in water and in a dilute polymer solution with an emphasis on phenomena at small scales. The experiment is performed by using a three-dimensional particle tracking velocimetry (3D-PTV) system. 3D-PTV allows to measure in a Lagrangian manner fields of velocity and velocity derivatives. An interpolation to the Eulerean grid allows to analyze properties of the mean flow and of the fluctuating velocity field, in addition to the small scale quantities such as vorticity, strain and their production terms. The comparison between the experimental results of the water and dilute polymer solution flows provides a direct observation of the influence of polymers on the mean, fluctuating and small scale properties.