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Boiling heat transfer and pressure drop of R134a and R1234yf in minichannels for low mass fluxes.

Transfert de chaleur lors de l'ébullition et chute de pression du R134a et du R1234yf à l'intérieur de minicanaux pour de faibles débits massiques.

Auteurs : MORTADA S., ZOUGHAIB A., ARZANO-DAURELLE C., et al.

Type d'article : Article, Article de la RIF

Résumé

Analysis of various existing correlations of predicting local heat transfer and pressure drop in minichannels is performed. Heat transfer coefficient is compared to experimental results. Tests are conducted in a 6-channel tube. Channels are rectangular with 1.1 mm hydraulic diameter. Test parameters were varied in the following ranges: mass flux G = 20–100 kg/m2.s, heat flux q” = 2–15 kW/m2, and vapor quality 0–1. Two working fluids are used: R134a and R1234yf. Contrary to previous studies, in this study convective boiling was identified as the dominant boiling regime. The effect of the critical heat flux on the heat transfer coefficient for low mass flux is also studied. The realized tests are compared to several correlations. Four different intervals of mass and heat fluxes are detected. A correlation of the heat transfer coefficient is proposed for these different intervals.

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Format PDF

Pages : 962-973

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    15 €

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Détails

  • Titre original : Boiling heat transfer and pressure drop of R134a and R1234yf in minichannels for low mass fluxes.
  • Identifiant de la fiche : 30004111
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 4
  • Date d'édition : 06/2012

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