ISSN:
1572-9567
Keywords:
Alkane mixtures
;
Grunberg and Nissan equation
;
high pressure
;
n-octane
;
n-dodecane
;
viscometer
;
viscosity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Viscosity coefficients measured with an estimated accuracy of 2% using a new design of self-centering falling body viscometer are reported for n-octane, n-dodecane, and equimolar mixtures of n-octane + n-dodecane and n-hexane + n-dodecane at 25, 50, 75, and 100°C at pressures up to the freezing pressure or 500 MPa. The data for a given composition at different temperatures and pressures are very satisfactorily correlated by a plot of ή, defined as 104ηV2/3/(MT)1/2 in the cgs system of units or, generally, 9.118×107ηV2/3/(MRT)1/2, versus logV′, where V' = V · V 0(T R)/V 0(T) and V 0 represents the close-packed volume at temperature T and reference temperature T R. The experimental results are fitted, generally well within the estimated uncertainty, by the equation $$\ln \eta ' = - 1.0 + \frac{{BV_0 }}{{V - V_0 }}$$ , where B and V 0 are temperature and composition dependent. Values of B and V 0 for the mixtures are simply related to values for the pure liquids. The binary mixing rule of Grunberg and Nissan is investigated. Values of the mixing parameter G are positive, tend to increase with increases in pressure, and also increase with increases in difference in carbon number of the two pure components.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00503937
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