Measurements of the Viscosity for Mixtures of R134a and Polyolester Oil at Low Oil-concentrations

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  • SATO Tomoaki
    Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology
  • ODAIRA Akihiro
    Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology
  • TAKAISHI Yoshinori
    Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology
  • OGUCHI Kosei
    Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology

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  • R134a/ポリオールエステル油混合系の低油濃度域における粘性率
  • R134a ポリオールエステルユ コンゴウケイ ノ テイユ ノウドイキ ニ オケル ネンセイリツ

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Abstract

The paper presents new measurements on the viscosity for the mixtures of R134a and polyolester oil at low oil-concentrations. The measurements were conducted with a newly developed oscillating cup viscometer making use of polarizer at oil-concentrations between 0 and 16 mass% and temperatures from 278.15 K to 288.15 K. The uncertainty in viscosity was estimated to be less than ±4.3%. It was found that even a small amount of the oil into R134a had a significant effect on the viscosity. It increased exponentially with oil-concentration. Mixing the oil into R134a up to an oil-concentration of 16 mass% tripled the viscosity. A correlation equation as a function of temperature and oil mass fraction was formulated to interpolate the experimental viscosity data.

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