Abstract
New viscosity measurements for the gaseous and supercritical state of the halogenated hydrocarbons R12, R113, and R114 and binary mixtures of R12 + R114 of different compositions are presented. The measurements were carried out at superheated and supercritical temperatures from 30 to 200° C and in the pressure range from 1 to 80 bar. Viscosity was measured with an oscillating-disk viscometer and the data obtained are relative to the viscosity of nitrogen. The estimated accuracy of the measured results is ±0.6%. The results obtained show that, at subcritical temperatures, the pressure effect on viscosity is negative. This anomalous behaviour is investigated in detail in this work. At atmospheric pressure the viscosity of gas mixtures is almost a linear function of their composition. At high pressure, the residual viscosities η -η 0 of both the pure components and the mixtures were used to follow a single relationship versus the residual reduced density ρ r0.
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Nabizadeh, H., Mayinger, F. Viscosity of refrigerants R12, R113, and R114 and mixtures of R12 + R114 at high pressure. Int J Thermophys 10, 701–712 (1989). https://doi.org/10.1007/BF00507990
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DOI: https://doi.org/10.1007/BF00507990