Abstract
The kinematic viscosity defined as a ratio of viscosity to density is one of the key properties in making important dimensionless numbers such as Prandtl number and Reynolds number. The authors have measured both viscosity and density of R134a/POE and R134a/PAG mixtures in the range of relatively low oilconcentrations at saturated liquid state. The density measurements up to 50 mass% were conducted with a densimeter making use of glass buoys within overall uncertainty of ±1.0% and the viscosity measurements up to 16 mass% with an oscillating-cup viscometer making use of polarizer with overall uncertainty less than ±3.5%. The kinematic viscosity, which is obtained from the experimental viscosity and density data, is presented for both R134a/POE and R134a/PAG mixtures in the range of temperatures from 278 to 288 K for oil-concentrations up to 15 mass%. The oil-concentration dependence of the kinematic viscosity for both mixtures is also reported.
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