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

Author(s) : LIN L., PENG H., CHANG Z., et al.

Type of article: Article, IJR article

Summary

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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Details

  • Original title: Experimental investigation on TiO2 nanoparticle migration from refrigerant–oil mixture to lubricating oil during refrigerant dryout.
  • Record ID : 30022265
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 77
  • Publication date: 2017/05
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.02.026

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