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Document IIF

Une étude numérique sur les types de production d'entropie dans trois différentes [chambres de mélange] d'éjecteur au R134a.

A computational study about the types of entropy generation in three different R134a ejector mixing chambers.

Auteurs : SIERRA-PALLARES J., GARCÍA del VALLE J., GARCÍA CARRASCAL P., et al.

Type d'article : Article, Article de la RIF

Résumé

The purpose of this investigation is to study the efficiency of a R134a ejector operating with three different mixing chambers by means of a CFD based entropy generation analysis. With the aid of the differential equation for entropy, the local entropy generation is pursued. Using this method, the areas where the irreversibilities occur are identified and geometry improvements suggested. The novelty of the numerical procedure presented herein is that the bulk entropy generation is analysed by means of four sources related with viscous dissipation and heat transfer, divided in mean and fluctuating terms. Entropy generation within the boundary layer has also been considered. The latter has proved to be small, as well as the heat transfer contribution. The fluctuating viscous dissipation accounts for more than 75% of the added entropy, being its main sources the shear layer after the nozzle exit and the shock wave trains, independently of their position.

Documents disponibles

Format PDF

Pages : 199-213

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : A computational study about the types of entropy generation in three different R134a ejector mixing chambers.
  • Identifiant de la fiche : 30016737
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 63
  • Date d'édition : 03/2016

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