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

Lin, Lingnan ; Peng, Hao ; Chang, Zheng ; Ding, Guoliang

International journal of refrigeration, 2017-05, Vol.77, p.75-86 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Experimental investigation on TiO2 nanoparticle migration from refrigerant–oil mixture to lubricating oil during refrigerant dryout
  • Autor: Lin, Lingnan ; Peng, Hao ; Chang, Zheng ; Ding, Guoliang
  • Assuntos: Dessèchement ; Dryout ; Huile lubrifiante ; Lubricating oil ; Migration ; Nanofrigorigène ; Nanoparticles ; Nanoparticules ; Nanorefrigerant
  • É parte de: International journal of refrigeration, 2017-05, Vol.77, p.75-86
  • Descrição: •Nanoparticle migration from refrigerant–oil mixture to lubricating oil during refrigerant dryout was experimentally studied.•Mixture-to-oil migration ratio within a whole refrigerant dryout process was measured by absorbance method.•Three measures were proposed for raising the mixture-to-oil migration ratio.•Mixture-to-oil migration is proved to be the main migration route that enables the nanoparticles to circulate. 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.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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