Experimental and Numerical Dynamic Investigation of a Swirling Jet: Application to Improve the Efficiency of Air Diffusion in an Occupied Zone

Bennia, A.; Reffas, A.; Khan, M. A. H.; Mohamadi, H. E.; Lateb, M.; Fellouah, H.

doi:10.47176/jafm.16.09.1805

Experimental and Numerical Dynamic Investigation of a Swirling Jet: Application to Improve the Efficiency of Air Diffusion in an Occupied Zone

Document Type : Regular Article

Authors

¹ Department of Electromechanics, University Mohamed El Bachir El Ibrahimi of Bordj Bou Arreridj, El-Anasser, 34030 Algeria

² Control, Testing, Measurement and Mechanical Simulation Laboratory, University Hassiba Benbouali Hay Salem, National Road 19, Chlef, 02000 Algeria

³ Department of Software and IT Engineering, École de technologie supérieure, Rue Notre-Dame Ouest, Montréal, QC, H3C 1K3 Canada

⁴ Department of Mechanical Engineering, Université de Sherbrooke 2500 Blvd. de l’Université, Sherbrooke Qc, J1K 2R1 Canada

10.47176/jafm.16.09.1805

Abstract

When reducing the energy prerequisites of buildings, the correct distribution of fresh air flows injected into the living rooms poses a problem. If the problem of mixing the injected air in the ambient air is not effectively solved, there will be a strong deterioration in air quality and comfort. In this research, a new design of swirling diffuser is investigated experimentally and numerically using large eddy simulations. The influence of fins is studied for the improvement of air diffusion and jet mixing with ambient air. The study was carried out for a fins angle of 30° with the jet's axis and 60° with the blowing orifice's plane with the condition of uniform heat flux of the air. The working fluid used is air. It has been validated that using fins leads to a greater spreading of the jet and good air mixing compared to those obtained from smooth tubes (circular nozzle). To enhance the accuracy of the turbulence models' predictions, three turbulence models are tested: the wall-adapting local eddy-viscosity turbulence model (LES/WALEVM), Smagorinski-Lilly (LES/S-LM) model and the kinetic-energy transport model (LES/K-ETM). It is worth highlighting that the LES/K-ETM model is well established in the prediction of swirling flows, which have been successfully compared with experimental results.

Keywords

Main Subjects

Mixing and Jets

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