Ferreira, A. G. M.[Abel G. M.], Egas, A. P. V.[Ana P. V.], Fonseca, I. M. A.[Isabel M.A.], Costa, A. C.[Ana C.], Abreu, D. C.[Danielly C.], Lobo, L. Q.[Lelio Q.]
The dynamic viscosities of glycerol were measured over the temperature range (293 to 394) K and atmospheric pressure using a Brookfield thermosel system. The combined expanded uncertainty of reported viscosity is better than 3.0% with a level of confidence 0.95 (k=2). The presented results are in good agreement with most values from literature. An extensive viscosity database for this substance was developed combining the values found in this work with those published in literature covering a wide range of temperature from glass transition temperature, (Tg =188 K) at atmospheric pressure and measurements of viscosity reported over the temperature range (263 to 398) K at pressures from (0 to 3) GPa. The main purpose of database construction was the development and study of reliable correlation models of viscosity valid in wide ranges of temperature and pressure. Some physicaly sound equations such as Mauro equation (MYEGA) and the Bond Strength- Coordination Number Flutuation (BSCNF) model were both used to correlate values selected from the database. From BSCNF the structural effects taking place near the glass transition were discussed in light of results obtained by recent experimental techniques. Some of the tested equations give overall absolute deviations less than 6 % in the range (190 to 440) K, a value which is sometimes close the experimental uncertainty. The Stickel derivative was used to determine the validity of the studied correlation equations. High pressure viscosity data allowed studying the temperature, pressure and density dependences of this property using the free volume, the thermodynamic scaling of viscosity and the removing of temperature dependence models. The free volume equation proved to be more accurate in the calculation of viscosity in wide T and p ranges with author overall uncertainties ranging from 4 % to 14%. From the models developed the effects of pressure on Tg and fragility of glycerol were studied. The results obtained are in good agreement with data selected from literature.
Compounds
#
Formula
Name
1
C3H8O3
glycerol
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.