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

In this paper we present numerical study, using software named Calculation FDS, of thermal plume that evolve from the source at the entrance of a vertical channel. In the literature, there are researchers who are interested in the interaction of plume with confined medium. These studies are based on the determination of the global structure of plume confined. It is found that this plume consists of three distinct zones. First zone near source (instability zone), followed by a second zone, the plume development, and third zone which is the zone of turbulence, Comparing the overall structure of the plume confined to that of the free plume, one 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 geometrical parameters on frequencies of these escapements and height an instability zone can be shown. The final aim is to establish correlations between the dimensionless Strouhal and Grashof numbers. [ABSTRACT FROM AUTHOR]