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Mutual diffusivities of difluoromethane and 2,3,3,3-tetrafluoropropylene dissolved in polyalkylene glycol lubricant.

Author(s) : TANG X., REN G., ZHANG K., BI S.

Type of article: IJR article

Summary

In this work, the mutual diffusivities of difluoromethane (R32) and 2,3,3,3-Tetrafluoropropylene (R1234yf) dissolved in Polyalkylene glycol (PAG) lubricant were studied experimentally based on the principle of dynamic light scattering. The pressure range of mutual diffusivity measurement is from 0.142 MPa to 3.371 MPa, and the temperature range is from 293.15 K to 353.15 K. The experimental data were correlated as the equation of temperature and pressure. The average relative deviation between the experimental data and the model is less than 1.34%. The results show that when the temperature is constant, mutual diffusivities of R32/PAG and R1234yf/PAG mixture decrease with the increasing of the solubility of refrigerants. The mutual diffusivity of R1234yf/PAG is less than that of R32/PAG at the same temperature and solubility. This may be due to the longer length of the R1234yf molecule and greater polarity, which results in the difficult diffusion in the lubricant. The molecular radius (0.164 and 0.299 nm) for the mutual diffusivity of R32 and R1234yf in PAG lubricants were obtained according to the Einstein-Stokes equation. The obtained radius values are within a reasonable order of magnitude compared to literature values. Since the molecular radius of R32 is smaller than that of R1234yf, which is also consistent with the experimental results in this work that the mutual diffusivity of R32 dissolved in PAG is larger than that of R1234yf.

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Pages: 41-47

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Details

  • Original title: Mutual diffusivities of difluoromethane and 2,3,3,3-tetrafluoropropylene dissolved in polyalkylene glycol lubricant.
  • Record ID : 30029829
  • Languages: English
  • Subject: HFCs alternatives
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 139
  • Publication date: 2022/07
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.04.003

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