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Analyse de la génération d'entropie et de la longueur optimale d'un tube d'évaporateur à écoulement diphasique.

Entropy generation analysis and optimum tube length of two-phase flow evaporator tube.

Auteurs : EZEORA O.

Résumé

Due to the dependence of boiling heat transfer rate on heat flux, saturation pressure, mass flux and refrigerant quality, efforts made to increase heat transfer rate often cause further drop in refrigerant saturation pressure. In this study, entropy generation mechanisms associated with two-phase flow in smooth evaporator tube subject to constant surface heat flux are investigated. Refrigerant flow was considered annular, steady and one-dimensional. Separated fluid model was applied and flow path discretised. The governing equations were solved for fluid properties and heat transfer coefficient at each discretised section using Newton-Raphson finite difference numerical technique. Entropy generation analysis was also conducted and the evaporator tube parameters optimized subject to pressure drop and volume constraints. It is shown that tube dimensions of length and diameter which result in minimum entropy generation rate may not necessarily be the optimum tube parameters. Optimum tube parameter is obtained that satisfies all given conditions.

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  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Entropy generation analysis and optimum tube length of two-phase flow evaporator tube.
  • Identifiant de la fiche : 2010-1794
  • Langues : Anglais
  • Source : 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Date d'édition : 14/07/2008

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