Author(s):
1. Žana Stevanović, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia
2. Gradimir Ilić, Faculty of Mechanical Engineering in Niš, Serbia
3. Mića Vukić , Faculty of Mechanical Engineering in Niš, Serbia
4. Predrag Živković, Faculty of Mechanical Engineering in Niš, Serbia
5. Ivan Lazović, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia

Abstract:
It is well known fact that, the flow of air movement indoor spaces in residential rooms is a very complex structure. In practice, usually there is in use ventilation systems with a number of air changes during the day. Also it was noted that the main air flow has a fully developed turbulent flow in ventilation ducts, grilles at the entrance and exit and downstream along the edges of obstacles. In the indoor space the main stream flow of air will have poorly developed properties of turbulent flow. Turbulence is directly caused by the presence of the wall causing border flow of Coanda effect. Far from grille, velocity profile of supplying air and turbulent kinetic energy decreases, leading to a laminated mainstream in some cases. In practical applications, most of the air flow is three-dimensional and unstable. These features make the simulation of supplying air flow in the room represent a great challenge for existing numerical codes and models. In this work, the main task is examination of the distribution of the effects of mechanical ventilation mainstream supplying air jets through the mask grid diffuser passes under a certain temperature and the room is heated, and the different positioning of masks grid diffuser inlet and outlet causes the main fluid flow affects the development of a turbulent flow in the area.

Key words:
Turbulence,Coanda effect,numerical models

Date of abstract submission:
14.02.2013.

Conference:
DEMI 2013

Applied paper from author