Measurement of the viscosity of HFC 134a in the temperature range 213-423 K and at pressures up to 30 MPa. [HCF 134a (1,1,1,2-tetrafluoroethane)]

Journal Article · Wed Jan 01 00:00:00 EST 1992 · International Journal of Thermophysics; (United States)

DOI:https://doi.org/10.1007/BF01141207· OSTI ID:7187255

Okubo, T; Hasuo, T; Nagashima, A ^[1]

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1. Keio Univ., Yokohama (Japan)

The viscosity of HFC 134a was measured over the range of temperatures from 213 to 423 K and pressures up to 30 MPa. The experimental method was that of the capillary flow and a closed-circuit high-pressure viscometer was used. The sample fluid was circulated through a stainless-steel capillary from a high-pressure plunger system. The constant of the capillary was calibrated against the reference standard, pure water. The viscosity of the sample was calculated from the flow rate, the pressure drop at the capillary, and the capillary constant using the Hagen-Poiseuille equation. Measurements were made at a total of 39 points on eight isotherms. The measurement uncertainty of the viscosities was estimated as [+-] 1.3%. Based on the present results, an empirical equation for the viscosity of HFC 134a has been correlated. The viscosity on the saturation line calculated by the equation compares with experimental viscosity data in other previous studies. There are rather considerable differences among these measurements. Comparisons of the data for HFC 134a with those for CFC 12 show that the viscosity of HFC 134a is similar in magnitude to that of CFC 12 at temperatures around 300 K but is higher at lower temperatures and lower at higher temperatures. The pressure gradients for these two corresponding substances are similar over the entire temperature range. 8 refs., 7 figs., 1 tab.

• OSTI ID: 7187255
• Journal Information: International Journal of Thermophysics; (United States), Vol. 13:6; ISSN 0195-928X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHLOROFLUOROCARBONS
VISCOSITY
REFRIGERANTS
MEASURING INSTRUMENTS
CAPILLARY FLOW
HIGH PRESSURE
PRESSURE GRADIENTS
TEMPERATURE RANGE 0273-0400 K
FLUID FLOW
FLUIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
TEMPERATURE RANGE
WORKING FLUIDS
360606* - Other Materials- Physical Properties- (1992-)