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Experimental investigation of vortex tube refrigerator with a divergent hot tube / Kun Chang in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 322-327 Titre : Experimental investigation of vortex tube refrigerator with a divergent hot tube Titre original : Etude expérimentale sur un réfrigérateur à tube vortex muni d'un tube chaud divergent Type de document : texte imprimé Auteurs : Kun Chang, Auteur ; Qing Li, Auteur ; Gang Zhou, Auteur Année de publication : 2011 Article en page(s) : pp. 322-327 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Vortex  tube  Refrigerator  Nozzle  Divergent  tube Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Energy separation performance of vortex tube can be improved by using a divergent hot tube. Experiments are carried out to investigate the influence of the geometrical parameters on vortex tube refrigeration capacity by using nitrogen as the working fluid. In this work, the parameters are focused on the divergence angle of hot tube, length of divergent hot tube and number of nozzle intakes. Experimental results present that there is an optimum angle for obtaining the highest refrigeration performance, and 4° is the optimal candidate under our experimental conditions. Divergent tube length which exceeds a critical length has slight effect on the refrigeration capacity. The critical length to diameter ratio is L/D = 12 in our experiment. Increasing number of nozzle intakes increases the sensitivity of temperature reduction and can obtain the highest possible temperature reduction. Moreover, similarity relations for the prediction of the cold exit stream are presented and confirmed by the experimental data. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002057 [article] Experimental investigation of vortex tube refrigerator with a divergent hot tube = Etude expérimentale sur un réfrigérateur à tube vortex muni d'un tube chaud divergent [texte imprimé] / Kun Chang, Auteur ; Qing Li, Auteur ; Gang Zhou, Auteur . - 2011 . - pp. 322-327. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 322-327 Mots-clés : Vortex  tube  Refrigerator  Nozzle  Divergent  tube Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Energy separation performance of vortex tube can be improved by using a divergent hot tube. Experiments are carried out to investigate the influence of the geometrical parameters on vortex tube refrigeration capacity by using nitrogen as the working fluid. In this work, the parameters are focused on the divergence angle of hot tube, length of divergent hot tube and number of nozzle intakes. Experimental results present that there is an optimum angle for obtaining the highest refrigeration performance, and 4° is the optimal candidate under our experimental conditions. Divergent tube length which exceeds a critical length has slight effect on the refrigeration capacity. The critical length to diameter ratio is L/D = 12 in our experiment. Increasing number of nozzle intakes increases the sensitivity of temperature reduction and can obtain the highest possible temperature reduction. Moreover, similarity relations for the prediction of the cold exit stream are presented and confirmed by the experimental data. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002057