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Effet de l'oxyde de cuivre utilisé comme nanolubrifiant sur l'échange de chaleur lors de l'ébullition libre du R134a.

Effect of CuO nanolubricant on R134a pool boiling heat transfer.

Auteurs : KEDZIERSKI M. A., GONG M.

Type d'article : Article, Article de la RIF

Résumé

This paper quantifies the influence of CuO nanoparticles on the boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. A lubricant based nanofluid (nanolubricant) was made with a synthetic ester and CuO particles. For the 0.5% nanolubricant mass fraction, the nanoparticles caused a heat transfer enhancement relative to the heat transfer of pure R134a/polyolester (99.5/0.5) of between 50 and 275%. A smaller enhancement was observed for the R134a/nanolubricant (99/1) mixture, which had a heat flux that was on average 19% larger than that of the R134a/polyolester (99/1) mixture. Further increase in the nanolubricant mass fraction to 2% resulted in a still smaller boiling heat transfer improvement of approximately 12% on average. Thermal conductivity measurements and a refrigerant/lubricant mixture pool-boiling model were used to suggest that increased thermal conductivity is responsible for only a small portion of the heat transfer enhancement due to nanoparticles.

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Pages : 791-799

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    20 €

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    Gratuit

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Détails

  • Titre original : Effect of CuO nanolubricant on R134a pool boiling heat transfer.
  • Identifiant de la fiche : 2009-1447
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 5
  • Date d'édition : 08/2009

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