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Thermal pressure applied to the prediction of viscosity of simple substances in the dense gaseous and liquid regions
Author(s) -
Lennert David A.,
Thodos George
Publication year - 1965
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690110132
Subject(s) - thermodynamics , krypton , viscosity , compressibility , argon , chemistry , xenon , thermal , monatomic gas , methane , analytical chemistry (journal) , chromatography , organic chemistry , physics
The reduced thermal pressure‐temperature ratio has been used to relate residual viscosity modulus for argon, krypton, and xenon into a unique relationship applicable for the dense gaseous and liquid regions. For these monatomic substances the critical compressibility factor is z c = 0.291. Values of (∂P R /∂T R ) p R vs. (μ —μ*)ζ on log‐log coordinates produced a linear relationship. For these simple substances, this relationship was used to predict viscosities with an average deviation of 3.0% for fifty eight experimental values. This relationship was also applied for the prediction of viscosities for nitrogen, oxygen and carbon dioxide. The approach developed in this study merits further examination with several additional substances. The lack of adequate thermal pressures in the dense gaseous and liquid regions of substances other than argon limits the use of this study to substances having critical compressibility factors z c = 0.291.