Surface tension measurement of oil/refrigerant mixture by maximum bubble pressure method |
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| Affiliation: | 1. Department of Mechanical Engineering, Shizuoka University, Hamamatsu, Shizuoka, 432-8561, Japan;2. Graduate School of Engineering, Shizuoka University, Hamamatsu, Shizuoka, 432-8561, Japan;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Energy and Power Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China |
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| Abstract: | Lubrication oil used in refrigerant compressors forms oil mist in the compressor shell. Some of the oil mist is discharged into a refrigeration cycle with refrigerant and causes degradation of heat transfer in heat exchangers. Since the generation of the oil mist is related to the Weber number, it is necessary to measure the surface tension of the oil/refrigerant mixture before discussing the oil mist generation in the compressor. In this study, the maximum bubble pressure method was adapted to measure the surface tension of PAG (polyalkylene glycol) oil/CO2 mixture. The density of the mixture needed for the measurement was also carried out. It was found that the surface tension of PAG/CO2 mixture sharply decreases with an increase in the concentration of the refrigerant in the mixture. The surface tension of the mixture under 10 MPa and 100 °C is estimated to be 14.6 mN m−1 by an extrapolation. |
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