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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

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

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v13.i2.40
pages 153-173

SPACE-TIME ANALYSIS OF A SELF-EXCITED AXISYMMETRIC HELIUM JET

S. Boujemaa
Faculté des Sciences de Tunis, Département de Physique, Campus Universitaire Le Belvédère, 1060 Tunis − Tunisie
Muriel Amielh
Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), UMR CNRS 6594, Technopôle Château Gombert, 49 rue F. Joliot-Curie, B.P.146, 13384 Marseille Cedex 13 − France
Marie-Pierre Chauve
Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), UMR CNRS 6594, Technopôle Château Gombert, 49 rue F. Joliot-Curie, B.P.146, 13384 Marseille Cedex 13 − France

ABSTRACT

An axisymmetric jet of pure helium issuing into ambient air is experimentally investigated. Fast flow visualizations associated with laser Doppler velocimetry measurements are used to study the effects of strong density variations on the dynamics of the instabilities, which develop in the near-field of the jet. Thanks to several typical space-time diagrams, made by image processing techniques, the characteristic global mode of the jet instability is highlighted and the effects of pairing processes and buoyancy on this instability mode are analyzed.


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