Viscosity of several liquid hydrocarbons as a function of temperature pressure and free volume

Viscosity measurements have been made on nine pure hydrocarbon liquids at six temperatures ranging from 15.56° to 135°C and at pressures as high as 4000 bars. The samples included rigid bicyclic compounds of relatively high symmetry and three n‐alkanes, n‐C12, n‐C15, and n‐C18. These data were analyzed using the Eyring significant‐structure theory, the Cohen—Turnbull free‐volume model, and the empirical Doolittle equations. All of these equations produced essentially identical fits to the data at atmospheric pressure. The hypothesis that the constants v0 and vs in these equations represent the specific volume of a ``solid'' or condensed phase was tested by comparing best‐fit values of these constants with experimental values for the solid‐phase specific volume.

The Cohen—Turnbull and Doolittle equations were modified for use at elevated pressures with the result that the values of v0 necessary to satisfy the equations at high pressures were shown to be analogous to the specific volumes of a glassy state at high pressures. Further, the change in v0 as a function of pressure was compared with the change in the experimental values of the solid‐phase volume at the melting point as a function of pressure and a definite correlation between the two was established.

Title	Viscosity of several liquid hydrocarbons as a function of temperature pressure and free volume
Creator	Hogenboom, David L.
	Dixon, J. A.
	Webb, W.
Publisher	Journal of Chemical Physics
Academic Department	Physics
Division	Natural Sciences
Organization	Lafayette College
Date Issued	1967
Date Available	2023-06-05
Type	Article
Language	English
Keyword	liquids
	organic compounds
	particle symmetry
Bibliographic Citation	Hogenboom, D. L., W. Webb, and J. A. Dixon (1967) "Viscosity of several liquid hydrocarbons as a function of temperature pressure and free volume." Journal of Chemical Physics 46 (7): 2586-2598.
Standard Identifier	DOI 10.1063/1.1841088
Standard Identifier	Handle 10385/q811km14h
Permalink	http://hdl.handle.net/10385/q811km14h
Rights Statement	In Copyright
Rights Holders	American Institute of Physics