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Chute de pression due au frottement lors de l'ébullition en écoulement diphasique d'un mélange R410A/huile à l'intérieur d'un tube à microailettes d'un diamètre de 5 mm : étude expérimentale et corrélation.

Experimental investigation and correlation of two-phase frictional pressure drop of R410A/oil mixture flow boiling in a 5 mm microfin tube.

Auteurs : DING G., HU H., HUANG X., et al.

Type d'article : Article, Article de la RIF

Résumé

This study presents experimental two-phase frictional data for R-410A/oil mixture flow boiling in an internal spiral grooved microfin tube with outside diameter of 5 mm. Experimental parameters include the evaporation temperature of 5°C, the mass flux from 200 to 400 kg/m2.s, the heat flux from 7.46 to 14.92 kW/m2, the inlet vapour quality from 0.1 to 0.8, and nominal oil concentration from 0 to 5%. The test results show that the frictional pressure drop of R410A initially increases with vapour quality and then decreases, presenting a local maximum in the vapour quality range between 0.7 and 0.8; the frictional pressure drop of R410A/oil mixture increases with the mass flux, the presence of oil enhances two-phase frictional pressure drop, and the effect of oil on frictional pressure drop is more evident at higher vapour qualities where the local oil concentrations are higher. The enhanced factor is always larger than unity and increases with nominal oil concentration at a given vapour quality. The range of the enhanced factor is about 1.0-2.2 at present test conditions. A new correlation to predict the local frictional pressure drop of R410A/oil mixture flow boiling inside the internal spiral grooved microfin tube is developed based on local properties of refrigerant-oil mixture, and the measured local frictional pressure drop is well correlated with the empirical equation proposed by the authors.

Documents disponibles

Format PDF

Pages : 150-161

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 : Experimental investigation and correlation of two-phase frictional pressure drop of R410A/oil mixture flow boiling in a 5 mm microfin tube.
  • Identifiant de la fiche : 2009-0090
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 1
  • Date d'édition : 01/2009

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