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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v11.i3.40
16 pages

EXPERIMENTAL STUDY OF THE INSTABILITIES IN THE LAMINAR TURBULENT TRANSITION ZONE OF AN AXISYMMETRIC JET AT LOW REYNOLDS NUMBERS

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
Najah Kechiche
Unit de Metrologie en Mecanique des Fluides et Thermique, UMFT 03/UR/11-09, Ecole Nationale d'Ingnieurs de Monastir, Rue Ibn El Jazzar, 5019, Monastir, Tunisie
Jacques Jay
Thermal Science Centre of Lyon (CETHIL - UMR CNRS 5008) National Institute of Applied Sciences of Lyon Lyon, France
Jean-Paul Schon
LTSI, UMR CNRS 5516 — Univ. J. MONNET, Saint-Etienne, FRANCE

ABSTRACT

The purpose of this work is to investigate the laminar zone of an axisymmetric jet at low Reynolds numbers with long laminar regions. Flow visualization associated with image processing is used to study the instabilities in the transition zone. The first instabilities which appear are the sinuous mode or (and) the varicose mode followed by symmetric or anti-symmetric Kelvin-Helmholtz instabilities. In this work, we study particularly the sinuous mode. Quantitative results are given on the frequencies and the velocity phase of the instabilities.


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