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1.
The thermodynamic activation function of viscous flow may be determined from the expression for the pre-exponential factor in the Eyring relationship (the viscosity coefficient), which is a function of density and relative permittivity, together with the thermal dependence of the viscosity coefficient. This method of determination is demonstrated for a series of n-alkanes C6–C20.List of symbols
A, B, C
parameters in empirical viscosity-temperature dependence
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E
molecular bond energies of liquid calculated from heat of evaporation in vacuum
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E
v
viscous flow activation energy
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G
activation Gibbs function of viscous flow
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H
v
heat of evaporation
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H
vb
heat of evaporation at boiling point
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H
viscous flow activation enthalpy
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k
Boltzmann constant
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m
weight of molecule
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M
relative molecular weight
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N
A
Avogadro constant
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q
total number of bonds in one mole of liquid
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R
gas constant
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S
id
entropy of one mole of compound in ideal gas state
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S
sat
entropy of one mole of compound in saturated vapour state
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S
activation entropy of viscous flow
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T
absolute temperature
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T
c
critical temperature
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T
r
reduced temperature
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T
c
critical volume
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T
f
free volume of liquid per molecule
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V
0
molar volume of molecules
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V
m
molar volume of liquid
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relative permittivity
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viscosity
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density
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r
reduced density 相似文献