Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K

Abstract

The liquid viscosity of six binary mixtures of HFC-134a with glycols l-ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol(400), and polypropylene glycol (2000)] was measured in the temperature range from 273 to 333 K. The viscosity was measured with an improved capillary viscometer instead of the rolling-ball viscometer reported in our previous work. The measurement uncertainty was estimated to be 1.6%. Most of the present data are higher than previous data, and the gap between the two sets of data increases further in low-viscosity regions. The present results obtained with laminar flow are more reliable than previous results, which are indefinite because of the limit of usefulness of the rolling-ball viscometer in low-viscosity regions.

Viscosity and density of liquid mixtures ofn-alkanes with squalane

“…The viscosity was measured using the capillary viscometer described earlier [2]. The viscometer was located in a water bath whose temperature was regulated to within 30 mK.…”

Viscosity measurements and correlations of binary mixtures: 1,1,1,2-tetrafluoroethane (HFC-134a)+tetraethylene glycol dimethylether (TEGDME)

“…However, in spite of their importance, there are only a few studies available in the literature on the thermophysical properties of the HFC-134a + PGDME system [2][3][4][5][6].…”

Viscosity Measurements and Correlation of the Squalane + CO2 Mixture

“…In our previous study, we measured the viscosity of squalane + hydrocarbon [1,2] and glycol + HFC-134a [3] systems. The present paper describes continuing work on the experimental determination of the viscosity of liquid mixtures consisting of a lubricating oil and refrigerants.…”