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Étude expérimentale sur la migration des nanoparticules de TiO2 depuis un mélange frigorigène-huile vers une huile lubrifiante durant le dessèchement du frigorigène.

Experimental investigation on TiO2 nanoparticle migration from refrigerant–oil mixture to lubricating oil during refrigerant dryout.

Auteurs : LIN L., PENG H., CHANG Z., et al.

Type d'article : Article, Article de la RIF

Résumé

The application of nanorefrigerant–oil mixture in refrigeration system requires continuous circulation of nanoparticles; however, only a small part of nanoparticles circulate by migration from the mixture to vapor within refrigerant dryout process. This study points
out a more important nanoparticle circulation way by migration from bulk refrigerant–oil mixture to oil excess layer, and quantitatively evaluate the mixture-to-oil migration ratio affected by oil mass fraction, nanoparticle mass fraction and heat flux.The nanorefrigerant–
oil mixture is TiO2/R141b/NM56; experimental conditions cover oil mass fraction of 5%– 20%, nanoparticle mass fraction of 0.2%–1.0%, and heat flux of 10–100 kW m-2; the mixture-to-oil migration ratio is measured by absorbance method. The results show that mixture-to-oil migration ratio ranges within 0.388–0.969, and increases averagely by 51.8%, 28.3% and 8.0% with increasing oil mass fraction, reducing nanoparticle mass fraction and lowering heat flux over the whole range of present conditions, respectively.

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Pages : 75-86

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Détails

  • Titre original : Experimental investigation on TiO2 nanoparticle migration from refrigerant–oil mixture to lubricating oil during refrigerant dryout.
  • Identifiant de la fiche : 30022265
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 77
  • Date d'édition : 05/2017
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2017.02.026

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