ISSN:
1572-9567
Schlagwort(e):
aromatic hydrocarbons
;
cyclohexane
;
free volume expression
;
hard-sphere theory
;
high pressure
;
n-alkanes
;
torsionally vibrating crystal method
;
viscosity
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract New experimental data on the viscosity of 12 organic liquids are presented at temperatures of 25, 30, 50, and 75°C and at pressures up to 110 MPa. The liquids measured are five n-alkanes (C6, C7, C8, C10, C12), cyclohexane, and six aromatic hydrocarbons (benzene, toluene, ethylbenzene, o-, m-, p-xylenes). The measurements were performed using a torsionally vibrating crystal method on a relative basis with an uncertainty less than 2%. A linear relationship between fluidity and molar volume, which is predicted from the hard-sphere theory, fails at pressures above 50 MPa. The rough hard-sphere model proposed by Chandler provides a reasonable representation of the data for aromatic hydrocarbons, while for n-alkanes the agreement is not satisfactory because of an aspherical shape of molecules. The viscosity data can be correlated well with the molar volume by a free-volume expression and also can be represented as a function of pressure by a similar expression to the Tait equation.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00502346
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