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Experiments on flow boiling characteristics of R32/lubricant oil mixtures in a multiport tube with circular minichannels.

Number: pap. n. 219

Author(s) : JIGE D., KIKUCHI S., EDA H., et al.

Summary

This study experimentally investigated the flow boiling heat transfer and pressure drop of R32/lubricant oil mixtures in a horizontal multiport tube with circular minichannels at a saturation temperature of 15 °C. The effects of mass velocity, heat flux, vapor quality, and oil concentration on the flow boiling heat transfer and pressure drop were clarified. The local heat transfer coefficient of R32/oil mixtures decreased with increasing oil concentration, as compared with that of pure R32, except under conditions of higher heat flux and lower quality. However, considering the increase in the bubble-point temperature with oil mixing, the degradation of heat transfer coefficient with oil mixing was small under conditions of higher mass velocity and quality. The frictional pressure drop of the R32/oil mixture was higher than that of pure R32 and increased with increasing oil concentration. The frictional pressure increased with increasing heat flux in the lower quality region.

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Details

  • Original title: Experiments on flow boiling characteristics of R32/lubricant oil mixtures in a multiport tube with circular minichannels.
  • Record ID : 30025964
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0219

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