Title: Exergy analysis of a counter-flow Ranque-Hilsch vortex tube having different helical vortex generators
Authors: Burak Markal; Orhan Aydın; Mete Avcı
Addresses: Karadeniz Technical University, Department of Mechanical Engineering, 61080 Trabzon, Turkey ' Department of Mechanical Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey. ' Department of Mechanical Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey
Abstract: In this study, thermodynamic analysis of a counter-flow vortex tube is made. Equations are derived for cold mass fraction (yr), entropy generation and irreversibility. Also, efficiency terms are defined based on the Carnot cycle by considering vortex tubes as both a cooling machine and a heat pump. Experiments are performed for various values of design parameters and working conditions. Experimental data obtained is then analysed thermodynamically. It is disclosed that irreversibility increases with an increase in the length of the helical vortex generator and in the inlet pressure. Both cooling and heating efficiencies are shown to decrease with an increase in the length of the helical vortex generator.
Keywords: counter flow vortex tubes; thermodynamic analysis; helical vortex generators; exergy efficiency; exergy analysis; cold mass fraction; entropy generation; irreversibility; cooling machines; heat pumps.
International Journal of Exergy, 2012 Vol.10 No.2, pp.228 - 238
Received: 24 Feb 2011
Accepted: 16 Jun 2011
Published online: 15 Mar 2012 *