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NEAR FIELD STRUCTURE OF TWIN TANDEM INCLINED AND VARIABLY EL-EVATED JETS IN CROSSFLOW

Radhouane, A.; Mahjoub, N.; Mhiri, H.; LePalec, G.; Bournot, P.;

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Jets in crossflow are of a high interest since they are central to a variety of indus-trial applications like fuel injectors, smokestacks, cooling of turbine blades and dilution holes in gas turbine combustors. The present work aims at performing an extensive exploration of the field generated by double tandem jets interacting with an oncoming crossflow. The jets are inclined (60°) and variably but similarly elevated as discharged from nozzles whose height varied between 0 and 5 cm. The jet nozzles discharge a characteristic industrial fume under a temperature gradient of 100 K with reference to the surrounding atmosphere temperature. Consideration is given to a steady, three-dimensional, incompressible and turbulent flow. The resolution of the different conservation law equations is carried out by means of the Compu-tational Fluid Dynamics (CFD) software, Fluent, together with the Reynolds Stress Model and a non uniform grid system. Once validation towards previous experimental data reached, emphasis was particularly giv-en to the induced interactions, namely jet-to jet, jets-to-crossflow and jets-to-jet nozzles inter-actions. Description was carried out in terms of the developed vortical structures, the estab-lished streamlines and further dynamic features, under an injection ratio R equal to 2. Examination was given to the symmetry plane and to different streamwise cross-sections. Such a consideration illustrated decreasing deviation and downstream reattachment of in-creasingly high jets. This issue is of particular interest as deeply involved in pollutants’ dis-persion in urban zones. Its resolution may provide viable solutions for reducing and/or pre-venting from inhabitants’ contamination.

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Palavras-chave: twin jets, crossflow, jet elevation, near field, vortical structures,

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DOI: 10.5151/meceng-wccm2012-19610

Referências bibliográficas
  • [1] Radhouane, A., Mahjoub Saïd, N., Mhiri, H., Le Palec, G., Bournot, P., "Dispersion of twin inclined fume jets of a variable height within a crossflow”, Defect and Diffusion Forum, vols. 312-315, pp.929-934, 201
  • [2] Briggs, G.A., “Plume rise from multiple sources “, Proceedings of cooling tower environment held at University of Maryland, pp. 161-179, 1974.
  • [3] Briggs, G.A., “Plume Rise Predictions. Lectures on Air Pollution and Environmental Impact Analyses”. American Meterological Society, pp. 59–111, 1975.
  • [4] Anfossi, D., Bonino, G., Bossa, F., Richiardone, R., “Plume rise from multiple sources: a new model”, Atmospheric Environment, 12, pp.1821-1826, 1978.
  • [5] Gangoiti, G., Sancho, J., Ibarra, G., Alonso, L., Garcïa, J.A., Navazo, M., Durana, N., Ilardia, J.L., “Rise of moist plumes from tall stacks in turbulent and stratified atmospheres”, Atmospheric Environment 31(2), pp. 253-269, 1997.
  • [6] Montgomery, T.L., Norris W.B, Thomas F.W., Carpenter S.B., “A simplified technique used to evaluate atmospheric dispersion of emissions from large plants”. J. Air. Poll. Control Ass. 23, pp. 388-457, 1973.
  • [7] Netterville D.D.J., “Plume rise, entrainment and dispersion in turbulent winds”. Atmospheric Environment, 24A, pp. 1061-1081, 1990.
  • [8] Bunsirisert, K., Orrala, C., Rahai, H.R, “Profiles of two elevated side-by-side turbulent jets in a crossflow”, 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, 2005.
  • [9] Moore, D.J., “A comparison of the trajectories of rising buoyant plumes with theoretical/ empirical models, Atmospheric Environment, 8, pp. 441-457, 1974.
  • [10] Karagozian, A.R., "Transverse jets and their control", Progress in Energy and Combustion Science, pp.1-23., 20
  • [11] Radhouane, A., Mahjoub Saïd, N., Mhiri, H., Le Palec, G., Bournot P., "Impact of the initial streamwise inclination of a double jet emitted within a cool crossflow on its tem-perature field and pollutants dispersion”, Heat and Mass Transfer, Springer, 45(6), pp. 805-823, 2009.
  • [12] Smith, S.H., Mungal M.G., “Mixing, structure and scaling of the jet in crossflow”. J. Fluid Mech 357:83–122,1998
  • [13] Radhouane, A., Mahjoub Saïd, N., Mhiri, H., Le Palec, G., Bournot, P., "Impact of the Temperature of Twin Inclined Tandem Jets on their Dynamic Interaction with a Cooler Oncoming Crossflow", Proceedings of the 7th International ASME Conference on Nanochannels, Microchannels and Minichannels (ICNMM2009-82029), 22-24 June, Po-hang, South Korea, 2009
  • [14] Mahjoub Said N., Mhiri, H., Golli, S., Le Palec, G., Bournot, P., “Three dimensional numerical calculations of a jet in an external crossflow: application to pollutant disper-sion”, ASME J. of heat transfer, 125, 2009.
  • [15] Patankar, S.V., Spalding, D.B., “A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows”, Int. J. Heat Mass Transf., 15, pp. 1787–1806, 1972.
  • [16] Demuren, A.O., Rodi, W., “Three Dimensional Numerical Calculations of Flow and Plume Spreading Past Cooling Towers”, J. Heat Transfer, 109, pp. 113–119, 1987.
  • [17] Radhouane, A., Bournot, H., Mahjoub Saïd, N., Mhiri, H., Le Palec, G., "Numerical and experimental study of a double jet inclination variation on its dynamic evolution within a crossflow”, Heat and Mass Transfer Journal, 45(12), pp. 1597-1616, 2009.
Como citar:

Radhouane, A.; Mahjoub, N.; Mhiri, H.; LePalec, G.; Bournot, P.; "NEAR FIELD STRUCTURE OF TWIN TANDEM INCLINED AND VARIABLY EL-EVATED JETS IN CROSSFLOW", p. 3847-3860 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-19610

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