Andrade-Type Correlations

Extension of Andrade-Type Correlations to Mixtures, 14 Extension of Corresponding States Methods for Viscosity of Mixtures, 15 Extension of the Theoretically Based Methods to Mixtures, 15 Viscosity Models for Undefined Mixtures, 16... 

VISCOSITY-TEMPERATURE RELATIONS AT LOW PRESSURES FOR PURE LIQUID, 7 Empirical Andrade-Type Relations, 7 Corresponding States Methods for Pure Hydrocarbons, 9 Other Prediction and Correlation Methods for the Viscosity of Pure Hydrocarbon Liquids, 11... 

There are several other correlations that use Andrade-type equations to correlate and/or predict the dynamic viscosities of pure hydrocarbons. They can all be used in a predictive mode for paraffinic hydrocarbons, or for correlation with substance specific parameters. One example is the correlation of Mehrotra [11] ... 

The Orbey and Sandler [13] correlation is slighty different in that it combines the idea of corresponding states with an Andrade-type relation by correlating reduced viscosity versus reduced temperature as follows ... 

For the correlation of the pure-component dynamic viscosity of hydrocarbons at ambient pressures, we recommend the use of the simple Andrade-type models. These models, including the more complex models such as those of Cao et al. [27,32] and of Lee and Thodos [24,25], require fitting at least one parameter to experimentally measured data. At present it is not evident that the more complex liquid viscosity models yield markedly better accuracy than the simpler Andrade-type models. 

The method of correlation of the viscosity of undefined liquid hydrocarbon mixtures depends upon the information available. If it is possible to measure at least one viscosity data point, then the methods of Puttagunta and co-workers [33-35] can be used. Other Andrade-type equations mentioned earlier also may be used for such cases with equal accuracy by fitting one parameter to a measured data point [13]. If information is available on the average boiling point of the mixture, methods such as those of Allan and Teja [12], Orbey and Sandler [13], or of Dutt [37] can... 

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