Title of article :
Viscosity Correlation for Isobutane over Wide Ranges of the Fluid Region1
Author/Authors :
E. Vogel، نويسنده , , C. Küchenmeister and E. Bich ، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Abstract :
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 tem-
perature 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
\0.40 in the dilute gas phase between room temperature and 600 K to \30
in the thermodynamic ranges in which the equation of state is valid as well as
where primary experimental data are available.
Keywords :
critical data assessment , free-volume model , Isobutane , liquidviscosity , vapor viscosity , viscosity correlation.
Journal title :
International Journal of Thermophysics
Journal title :
International Journal of Thermophysics