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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v40.i2.10
pages 91-105

Experimental Investigation of Vortical Structures in the Near Field of an Axisymmetric Jet by Time-Series Analysis

Yassine Zaouali
Metrology and Energetic Systems (UR11ES59) School of Engineering of Monastir Monastir, Tunisia
Habib Ben Aissia
National School of Engineers of Monastir, Metrology Research Unit and Energy Systems, 5000 Monastir, Tunisia
Jacques Jay
Thermal Science Centre of Lyon (CETHIL - UMR CNRS 5008) National Institute of Applied Sciences of Lyon Lyon, France
Amina Meslem
LaSIE, University of La Rochelle Pole Sciences et Technologie La Rochelle, France

RESUMO

The study herein focuses on the spatio-temporal evolution of a free natural air jet discharging from a round nozzle in stagnant air. Five Reynolds numbers extending from 1300 to 1700 are considered. The jet behavior related to its vortical structures is investigated in the first 6 diameters downstream from the nozzle via high-speed flow visualization and time-series analysis. It has been observed a transition from helical to axisymmetric vortical structures mode in the shear layer of the jet for a Reynolds number of 1500. Additionally, the spatio-temporal visualization of the traces that vortical structures design on parallel and horizontal lines to the jet axis permits to determine their convection velocity, life duration and axial progression before breaking-up. Particular attention is paid to the axial variation of the vortical structures frequency and the jet Strouhal number as function of the Reynolds number.


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