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Free volume theory for viscosity of simple nonpolar liquids. Part I. Pure components
Author(s) -
Gubbins Keith E.,
Tham M. J.
Publication year - 1969
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.690150225
Subject(s) - molality , thermodynamics , allowance (engineering) , volume (thermodynamics) , viscosity , chemistry , constant (computer programming) , simple (philosophy) , melting point , temperature dependence of liquid viscosity , melting temperature , relative viscosity , materials science , physics , organic chemistry , epistemology , aqueous solution , computer science , engineering , programming language , mechanical engineering , philosophy , composite material
Abstract An improved free volume theory is presented, and is shown to predict the variation of viscosity with temperature and pressure satisfactorily for liquids composed of simple, nonpolar molecules, when the density is greater than twice the critical value. Allowance is made for the temperature dependence of the minimum free volume for a jump, and for the density dependence of the activation energy at constant volume. Corresponding states relationships are provided for these quantities, the reducing parameters being the temperature and molal volum at the melting point.