ABSTRACT

The viscosities of liquidmixtures of isobutane with squalane, which seem to be representative of mixtures of refrigerants with refrigeration oil, were measured from 273.15 to 333.15K at pressures to 30MPa using a falling-body viscometer. The uncertainty of the measurements was estimated to be no larger than 2.9%. The experimental viscosity values were fitted with a Tait-like equation within 2.8%. There are large deviations between the experimental data and calculated values predicted by the equation of Kanti et al., which is derived from Flory s theory. By introducing two index numbers of the energetic mixing rule into the equation, the predictions could be improved considerably.

Compounds

#	Formula	Name
1	C30H62	2,6,10,15,19,23-hexamethyltetracosane
2	C4H10	2-methylpropane

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	16
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Constant-volume piezometry	16
POMD	2 1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	80
POMD	2 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Constant-volume piezometry	80

Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Measurements of the Liquid Viscosities of Mixtures of Isobutane with Squalane to 30 MPa

Kumagai, A., Tomida, D., Yokoyama, C.

ABSTRACT