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Effet de la concentration sur des mélanges de R134a et de nanolubrifiant Al2O3 sur la surface d'une cavité de retour.

Effect of concentration on R134a/Al2O3 nanolubricant mixture boiling on a reentrant cavity surface.

Auteurs : KEDZIERSKI M. A.

Type d'article : Article, Article de la RIF

Résumé

This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a Turbo-BII-HP boiling surface. Nanolubricants with 10 nm diameter Al2O3 nanoparticles of various volume fractions (1.6%, 2.3%, and 5.1%) in the base polyolester lubricant were mixed with R134a at two different mass fractions (0.5% and 1%). The study showed that nanolubricants can improve R134a boiling on a reentrant cavity surface as long as the nanoparticles remain well dispersed in the lubricant and are at sufficiently large concentration. For example, three of the refrigerant/nanolubricant mixtures with the smallest nanoparticle mass fraction exhibited average enhancements over the entire heat flux range of approximately 10%. However, when the nanoparticle mass fraction was increased to a point that likely encouraged agglomeration, an average heat transfer degradation of approximately 14% resulted. An existing model was used to predict the boiling heat transfer.

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Format PDF

Pages : 36-48

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    20 €

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    Gratuit

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Détails

  • Titre original : Effect of concentration on R134a/Al2O3 nanolubricant mixture boiling on a reentrant cavity surface.
  • Identifiant de la fiche : 30012896
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 49
  • Date d'édition : 01/2015

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