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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2000

Volume 1 - Thermal Sciences 2000
Proceedings of the International Thermal Science Seminar Bled, Slovenia, June 11 – 14, 2000

604 pages

Volume price - $120.00

SCALAR TRIPLE MOMENTS IN VARIABLE DENSITY TURBULENT JETS: EXPERIMENT AND MODEL

Mounir Bouslimi
Faculté des Sciences de Tunis, Département de Physique, Campus Universitaire Le Bélvèdere, 1060 Tunis - Tunisie

Adel Gharbi
Faculté des Sciences de Tunis, Département de Physique, Campus Universitaire Le Bélvèdere, 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

Taieb Lili
Faculté des Sciences de Tunis, Département de Physique, Campus Universitaire Le Bélvèdere, 1060 Tunis - Tunisie

ABSTRACT

The present paper is concerned with the coupling between the velocity and scalar fields (temperature or gas mass fraction) in variable density turbulent axisymmetric jets both through experimental and numerical approaches. Some results for mixed moments are obtained in the near-field (X/D_j<20) of these jets with a new measurement technique combining hot or cold wire and LDV. A triple moment model based on Deardoff works is developed for the far-field of a helium jet (X/D_j>90). These results are compared with the experimental and numerical study of Panchapakesan and Lumley (1993) in the far-field of a helium jet. The results confirm that the mixing is more efficient and rapid when the density of the central jet is low. Numerical results show that the present model may be improved by taking into account pressure and dissipation terms for predictions of configurations with small density fluctuations. Whatever, for strong density fluctuations some new modelling propositions are needed for better predictions.