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Analyse numérique de la génération d'entropie et nombre de Reynolds optimal pour le développement de la convection laminaire forcée dans des canaux sinusoïdaux avec divers rapports longueur-diamètre.

Numerical analysis of entropy generation and optimal Reynolds number for developing laminar forced convection in double-sine ducts with various aspect ratios.

Auteurs : KO T. H.

Type d'article : Article

Résumé

In the paper, the entropy generation in a double-sine duct, which is frequently used in plate heat exchangers, is investigated by numerical methods. The Reynolds number (Re) at inlet covers ranges from 86 to 2000, and wall heat flux varies as 160, 320 and 640 W/m2. Three aspect ratio cases (2, 4 and 8) are investigated. The results indicate that the entropy generation, in cases with larger Re and smaller wall heat flux is dominated by the entropy generation due to frictional irreversibility; whereas the entropy generation is dominated by the entropy generation due to heat transfer irreversibility in cases with smaller Re and larger wall heat flux. The results provide important information for the heat exchanger design since the thermal system could have the least irreversibility and best exergy utilization if the optimal Re and optimal aspect ratio is used according to the practical design conditions. [Reprinted with permission from Elsevier. Copyright, 2005].

Détails

  • Titre original : Numerical analysis of entropy generation and optimal Reynolds number for developing laminar forced convection in double-sine ducts with various aspect ratios.
  • Identifiant de la fiche : 2006-2246
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 49 - n. 3-4
  • Date d'édition : 02/2006

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