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Evaluation of wettability of solid surface with oil/refrigerant mixture.

Number: pap.1054

Author(s) : FUKUTA M., SUMIYAMA J., MOTOZAWA M., et al.

Summary

In order to reduce an oil amount discharged with refrigerant from a refrigerant compressor, oil separation from the refrigerant in a compressor shell or an oil separator has been investigated by many researchers. The oil separation in the compressor shell or the separator strongly depends on droplet size of oil mist generated in the compressor and condition of oil film formed on an inner surface of the compressor shell or the separator. The oil mist diameter and generation mechanism of the oil mist are affected by surface tension of the oil, while the condition of the oil film on the inner surface is influenced by wettability of the surface with the oil. In addition, dissolution of the refrigerant into the oil changes the surface tension and the wettability of the surface. In this study, the surface tension of the oil/refrigerant mixture and the wettability of the solid surface with the oil/refrigerant mixture were examined as a first step of the study on the generation mechanism and the droplet behavior of the oil mist in the compressor. The surface tension of PAG oil/CO2 mixture was measured by a pendant drop method and the wettability of a PTFE solid surface with the mixture was evaluated by measuring a contact angle. It is found that the surface tension of the PAG/CO2 mixture decreases steeply with increasing the refrigerant concentration in the oil. The droplet of the mixture keeps its shape with equilibrium condition on the PTFE plate. The contact angle on the PTFE surface decreases with the refrigerant concentration in the oil due to reduction of the surface tension.

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Pages: 9 p.

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Details

  • Original title: Evaluation of wettability of solid surface with oil/refrigerant mixture.
  • Record ID : 30019453
  • Languages: English
  • Source: 2016 Purdue Conferences. 23rd International Compressor Engineering Conference at Purdue.
  • Publication date: 2016/07/11

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