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Effects of variable thermophysical properties on flow and energy separation in a vortex tube / A. Ouadha in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2426–2437 Titre : Effects of variable thermophysical properties on flow and energy separation in a vortex tube Titre original : Effets de propriétés thermophysiques variables sur l'écoulement et la séparation d'énergie dans un tube vortex Type de document : texte imprimé Auteurs : A. Ouadha, Auteur ; M. Baghdad, Auteur ; Y. Addad, Auteur Année de publication : 2014 Article en page(s) : pp. 2426–2437 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Vortex  tube;  Exergy  analysis;  RSM  model Résumé : A numerical study has been conducted to investigate the effects of variable fluid properties on the prediction of a basic tube vortex design. Beforehand, a literature review is presented to highlight some of the recent advances in the enhancements of the device design and its efficiency. The three-dimensional computations with constant and variable properties revealed that the constant thermophysical assumption might not have a dramatic effect if the aim is to predict global values only, but extra caution should be taken for an in-depth flow assessment. The exergy analysis conducted suggests that the highest exergy efficiency, for the current device design, ranges from 38% to 46% depending on the inlet pressure value. Based on the current numerical analysis; rather large exergy losses are due to irreversibility occurring at either; the lowest or the highest cold mass fraction boundary conditions. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001965 [article] Effects of variable thermophysical properties on flow and energy separation in a vortex tube = Effets de propriétés thermophysiques variables sur l'écoulement et la séparation d'énergie dans un tube vortex [texte imprimé] / A. Ouadha, Auteur ; M. Baghdad, Auteur ; Y. Addad, Auteur . - 2014 . - pp. 2426–2437. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2426–2437 Mots-clés : Vortex  tube;  Exergy  analysis;  RSM  model Résumé : A numerical study has been conducted to investigate the effects of variable fluid properties on the prediction of a basic tube vortex design. Beforehand, a literature review is presented to highlight some of the recent advances in the enhancements of the device design and its efficiency. The three-dimensional computations with constant and variable properties revealed that the constant thermophysical assumption might not have a dramatic effect if the aim is to predict global values only, but extra caution should be taken for an in-depth flow assessment. The exergy analysis conducted suggests that the highest exergy efficiency, for the current device design, ranges from 38% to 46% depending on the inlet pressure value. Based on the current numerical analysis; rather large exergy losses are due to irreversibility occurring at either; the lowest or the highest cold mass fraction boundary conditions. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001965