NUMERICAL STUDY OF THE STRUCTURE OF THERMAL PLUME IN A VERTICAL CHANNEL: EFFECT OF THE HEIGHT OF CANAL

Abstract

In this paper we propose to study numerically, by means of a software Named Calculation FDS, a thermal plume evolve from a source at the entrance to of a vertical channel. In the literature, there are researchers who interested in the interaction of plume with his the confinement medium. These studies are based on the determination of the global structure of plume confined. They found that this plume consists of three distinct zones. A first zone near source (instability zone) followed by a second zone, such as the development of plume, and a third zone which is the zone of turbulence, Comparing the overall structure of the plume confined to that of the free plume, we can identify the presence of a third zone (zone of instability). The aim is firstly to determine the height of the instability zone located above of source, and secondly, to make a spectral study frequencies exhaust. Thus, effects of the geometrical parameters on frequencies of these escapements and the height an instability zone. The final aim is to establish correlations between the dimensionless numbers of Strouhal and Grashof.

Keywords

Dates

  • Submission Date2013-01-23
  • Revision Date2014-01-02
  • Acceptance Date2014-03-07
  • Online Date2014-06-15

DOI Reference

10.2298/TSCI130123058J

References

  1. M. Tan, Opposite sunspaces passive solar air heating system, Solar Energy, 60 (1997), pp. 127-134.
  2. Bezian J. J. and Arnaud G., Application de la convection naturelle en cavité inclinée au chauffage solaire passif, Architecture solaire. Conférence internationale sur l'architecture solaire, (2 ref.) (1983), pp. 424-429 .
  3. Mahmoud A. O. M., Ben Maad R., and Belgith A., interaction d'un écoulement de thermosiphon avec un panache thermique à symétrie axiale : étude expérimentale, Rev. Gen. Therm. 37 (1983), pp :385-396.
  4. Bouslimi J. and Dehmani L., Experimental investigation of the thermal field of a turbulent plume guided cylinder-preliminary results, Exp. Ther. Fluid 29 (2004), pp : 477-484.
  5. Zinoubi J., Ben Maad R. and A. Belguith, Influence of the vertical source cylinder spacing on the iteraction of a thermal plume with a thermosiphon flow : an experimental study, Experimental thermal and fluid 28 (2004), pp : 329-336.
  6. Ben Maad R. and A. Belguith, The use of grid-generated turbulence to improve heat transfer impossive solar systems, Renevable Energy vol 2 Printed in great Britain (1992), pp: 333-336.
  7. Gammoudi, A., Zinoubi, J., M., and Maad, R. B., Experimental study of a thermal plume evolving in a vertical heated channel: influence of the temperature of the plume source, Int. Rev. Mech. Eng., vol. 4, no. 3(2010), pp. 288-296.
  8. Naffouti T., Zinoubi J and Ben Maad R., Experimental characterization of a free thermal plume and in interaction with its material environment, Applied Thermal Engineering 30 (2010), pp 1632-1643.
  9. Belgacem Jouini, Mourad Bouterra, Olivier Vauquelin, Afif El Cafsi, Ali Belghith, Thermal Plume in a Vertical Channel: Effect of the Source-Channel Vertical Spacing, Heat Transfer Research, 2011, Vol. 42, No. 6 pp: 557-569.
  10. N.L. Ryder, J.A. Sutula, C.F. Schemel, A.J. Hamer, V.V. Brunt, Consequence modeling using the fire dynamics simulator, J. Hazard. Mater. 115 (2004) 149-154.
  11. N.L. Ryder, C.F. Schemel, S.P. Jankiewicz, Near and far field contamination modeling in a large scale enclosure: fire dynamics simulator comparisons with measured observations, J. Hazard. Mater. 130 (2006) 182-186.
  12. L.H. Hu, N.K. Fong, L.Z. Yang, W.K. Chow, Y.Z. Li, R. Huo, Modeling fire-induced smoke spread and carbon monoxide transportation in a long channel: fire dynamics simulator comparisons with measured data, J. Hazard. Mater. 140 (2007) 293-298.
  13. Kevin McGrattan, Simo Hostikka, Jason Floyd, Howard Baum, Ronald Rehm, William Mell Randall McDermott and Forney G(2010), Fire Dynamics Simulator (Version 5.5) Technical Reference Guide. NIST Special Publication 1018-5, June 23, 2010.
  14. Kevin McGrattan., Randall McDermott, Simo Hostikka, Jason Floyd(2010), Fire Dynamics Simulator (Version 5.5) User‘s Guide., NIST Special Publication 1019-5, June 23, 2010.
  15. Smagorinsky J(1963), General circulation experiments with primitive equations-I, the basic experiment, Monthly Weather Review 91 (1963) 99-105.
  16. Thomas PH (1968), The Movement of Smoke in Horizontal Passages Against an Air Flow, Fire Research Note No. 723, Fire Research Station, Watford, UK, 1968.