Journal
INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume 21, Issue 2, Pages 343-356Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/A:1006623310780
Keywords
critical data assessment; free-volume model; isobutane; liquid viscosity; vapor viscosity; viscosity correlation
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A new representation of the viscosity of isobutane has been developed. The representative equations include zero-density and initial-density dependence correlations. The higher density contributions to the residual viscosity are formed by a combination of double polynomials in density and reciprocal temperature and of a free-volume term with a temperature-dependent close-packed density. The new full surface correlation is based on primary experimental data sets selected as a result of a critical assessment of the available information. The validity of the representation extends from the triple point to 600 K and 35 MPa in accordance with the modified Benedict-Webb-Rubin equation of state by Younglove and Ely (1987). The uncertainty of the representation varies from +/- 0.4% in the dilute gas phase between room temperature and 600 K to +/- 3% in the thermodynamic ranges in which the equation of state is valid as well as where primary experimental data are available.
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