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An experimental study on the propagation of a turbulent front generated by an oscillating grid

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.140
pages 125-128

Markus Holzner
Institute of Environmental Engineering, ETH - Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland

Alexander Liberzon
School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Ramat Aviv 69978, Israel

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

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

K. Hoyer
Institute of Environmental Engineering, ETH - Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland

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

Abstrakt

This report presents experimental results on the propagation of a turbulent front induced by an oscillating grid starting from rest. The study is divided into two parts. The purpose of a first investigation is to validate vorticity measurements for the detection of the turbulent/non-turbulent interface for oscillating grid turbulence. This is done using particle image velocimetry (PIV) and resolving the larger scales of the flow. The results of these measurements show, that level-based detection of a turbulent front is well applicable to an unsteady flow, such as grid turbulence advancing into a fluid at rest. Secondly, 3D scanning particle tracking velocimetry (3D-SPTV) was used to yield Lagrangian flow information at the turbulent/non-turbulent interface with focus on the smaller scales.

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