Viscosity Measurement of cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) by Tandem Capillary Tubes Method.

• The viscosity data of R1234ze(Z) is presented. • The expanded uncertainty of the experimental data is calculated. • The correlation of viscosity at saturation state is developed A Hydro-Fluro-Olefin (HFO) cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) can be assessed as a promising working fluid in the high-temperature heat pump as it has a low global warming potential (GWP). In this work, the viscosity of R1234ze(Z) is measured in liquid and vapor phases by the method of tandem capillary tubes. The viscosity measurements were performed from 0.5 to 4.08 MPa pressure over a temperature ranges from 313.74 to 414.31 K at liquid and 354.07 to 455.80 K at vapor phase. Total expanded uncertainties of the viscosity measurement with k = 2 and 95% confidence level in liquid and vapor phase are lower than ±2.19% and ±2.59%, respectively. Viscosities at saturation conditions are estimated from experimental measurement data by the extrapolation method. Simplified correlations are developed in terms of saturation temperature for the viscosity of liquid and vapor at saturation conditions. [ABSTRACT FROM AUTHOR]