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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2006

Volume 1 - Turbulence, Heat and Mass Transfer 5
Proceeding of The International Symposium on Turbulence, Heat and Mass Transfer - Dubrovnik, Croatia, September 25-29, 2006

806 pages

Volume price - $246.00

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

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

A. Liberzon
Institute of Environmental Engineering, ETH - Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland

M. Guala
Institute of Environmental Engineering, ETH - Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland

A. Tsinober
Department of Fluid Mechanics and Heat Transfer, School of Mechanical Engineering, Tel-Aviv University, P.O. Box 39040, Tel-Aviv 69978, Israel

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

W. Kinzelbach
Institute of Environmental Engineering, ETH - Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland

ABSTRACT

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.