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Document IIF

Chute de pression diphasique et transfert de chaleur par écoulement en ébullition dans un tube alvéolé amélioré lors de l'insertion d'une tige ronde solide.

Two-phase pressure drop and flow boiling heat transfer in an enhanced dimpled tube with a solid round rod insert.

Auteurs : AYUB Z. H., AYUB A. H., RIBATSKI G., et al.

Type d'article : Article, Article de la RIF

Résumé

An experimental study was conducted on a 19.05?mm (outer diameter) dimpled enhanced tube to evaluate the in-tube two phase heat transfer and pressure drop performance in an annular section created between the enhanced tube and a solid round PVC rod. The purpose of the study was to understand the effect of forced early transition to annular flow on the pressure drop and heat transfer coefficient in a horizontal tube. The refrigerant studied was R-134a at a saturation temperature of 5?°C, heat flux range 2.5 to 15?kW m-2, mass flux from 80 to 200?kg?m-2?s-1 and inlet vapor quality of 0.12 to 0.72. Flow pattern and pressure drop results were obtained under adiabatic conditions. Under similar operating conditions the enhanced tube with a rod exhibited three times higher heat transfer performance versus same size smooth empty tube with lower pressure drop penalty at lower mas flux.

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Pages : 1-13

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Détails

  • Titre original : Two-phase pressure drop and flow boiling heat transfer in an enhanced dimpled tube with a solid round rod insert.
  • Identifiant de la fiche : 30021899
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 75
  • Date d'édition : 03/2017
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2017.01.008

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