Estimation of viscosity of liquid mixtures using Hildebrand's fluidity model (original) (raw)

Viscosity of binary non-electrolyte liquid mixtures: Prediction and correlation

Chemical Industry and Chemical Engineering Quarterly, 2008

The viscosity of 31 binary liquid mixtures containing diverse groups of organic compounds, determined at atmospheric pressure: alcohols, alkanes (cyclo and aliphatic), esters, aromatics, ketones etc., were calculated using two different approaches, correlative (with Teja-Rice and McAllister models) and predictive by group contribution models (UNIFAC-VISCO, ASOG-VISCO and Grunberg--Nissan). The obtained results were analysed in terms of the applied approach and model, the structure of the investigated mixtures, the nature of components of the mixtures and the influence of alkyl chain length of the alcohol molecule.

Prediction of the viscosity of multi-component liquid mixtures

Chemical Engineering Science, 2000

The work of Heric and Brewer (1969 Journal of Chemical Engineering Data, 14, 55}63) which involved testing a number of liquid viscosity correlations resulted in concluding that the McAllister (1960 A.I.Ch.E. Journal, 6, 427}431) model was the most accurate. However, the fact that the McAllister model is correlative in nature severely limits its practicality and usefulness. This is because costly and time-consuming data are required for the determination of the adjustable (or interaction) parameters contained in that model (Asfour, Cooper, Wu & Zahran, 1991, Industrial and Engineering Chemistry Research, 13, 1666}1669). This study reports the development of a generalized expression of the McAllister model for multi-component liquid mixtures, evaluation of the generalized McAllister model parameters, converting the McAllister model into a predictive model, and comparison of the predictive capability of generalized McAllister model with those of the GC-UNIMOD reported by Cao, Knudsen, Fredenslund and Rasmussen (1993a,b Industrial and Engineering Chemistry Research, 32, 2077}2087, 2088}2092) and with the generalized corresponding states principle (GCSP) which was reported by Teja and Rice (1981 Industrial and Engineering Chemistry, Fundamentals, 20, 77}81). The comparison clearly indicated that the generalized McAllister model is consistently far superior to the GC-UNIMOD and the GCSP in predicting the viscosities of ternary, quaternary, and quinary liquid mixtures. This, no doubt, represents a signi"cant accomplishment in the area of predicting the viscometric behaviour of multi-component liquid mixtures.

Prediction of the viscosity of liquid mixtures: An improved approach

International Journal of Thermophysics, 2000

Page 1. International Journal of Thermophysics, Vol. 21, No. 2, 2000 Prediction of the Viscosity of Liquid Mixtures: An Improved Approach1 MJ Assael,2, 5 NK Dalaouti,2 JH Dymond,3 E. Perperi,2 and WA Wakeham4 ... According to Di Pippo et al. ...

Prediction of the viscosity of liquid mixtures

International Journal of Thermophysics, 2001

This paper describes the application of the theoretically based scheme of Vesovic and Wakeham, modified by making use of the hard-sphere model of Dymond and Assael, to the prediction of the viscosity of liquid mixtures. The purpose of the paper is to examine this scheme in more detail than earlier to find out in what circumstances it works well and

Correlation of the liquid mixture viscosities

Journal of the Serbian Chemical Society, 2012

In this paper, forty-two selected correlation models for liquid mixture viscosities of organic compounds were tested on 219 binary and 41 ternary sets of experimental data taken from the literature. The binary sets contained 3675 experimental data points for 70 different compounds. The ternary sets contained 2879 experimental data points for 29 different compounds. The Heric I, Heric-Brewer II, and Krishnan-Laddha models demonstrated the best correlative characteristics for the binary mixtures (overall absolute average deviation < 2 %). The Heric I, Heric-Brewer II, Krishnan-Laddha and Heric II models demonstrated the best correlative characteristics for the ternary mixtures (overall absolute average deviation < 3 %).

Theoretical and Experimental Methods for Study of Binary mixtures viscosity at T= 303.15

2018

Molecular interactions in binary mixtures composed of a xylene and selected 1-butanol 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol was investigated by measuring the viscosity at T= 303.15 K. From experimental data, viscosity deviation was calculated. Values of viscosity deviations for all binary mixtures are negative and increase with increase of alcohols chain length. Obtained data were interpreted based on the type and magnitude of the physico-chemical interactions in the binary liquid systems. free volume theory was applied to correlate the viscosities of binary mixtures and correlated values by this model were good enough and obtained data were within the uncertainty region.Keywords: Viscosity; xylene; 1-Alkanol; free volume theory

Viscosity Deviation Modeling for Binary and Ternary Mixtures of Benzyl Alcohol-N-Hexanol-Water

Materials

Knowing the thermodynamic and transport properties of liquid systems is very important in engineering for the development of theoretical models and for the design of new technologies. Models that allow accurate predictions of thermodynamic and transport properties are needed in chemical engineering calculations involving fluid, heat, and mass transfer. In this study, the modeling of viscosity deviation for binary and ternary systems containing benzyl alcohol, n-hexanol, and water, less studied in the literature, was carried out using Redlich and Kister (R-L) models, multiple linear regression (MLR) models and artificial neural networks (ANN). The viscosity of the binary and ternary systems was experimentally determined at the following temperatures: 293.15, 303.15, 313.15, and 323.15 K. Viscosity deviation was calculated and then correlated with mole fractions, normalized temperature, and refractive index. The neural model that led to the best performance in the testing and validati...

Empirical and Semi-theoretical Methods for Predicting the Viscosity of Binary n Alkane Mixtures

International Journal of Thermophysics, 2005

In this study, empirical and semi-theoretical methods for predicting the viscosity of binary mixtures of n-alkanes are presented at atmospheric pressure and in the temperature range from 288 to 333 K. In the empirical viscosity calculation method, a modified version of the Andrade equation and a simple mixture rule are used. The proposed semi-theoretical method employs both the Enskog's hard-sphere theory for dense fluids and the principle of corresponding states. The viscosities of binary mixtures of n-heptane with n-hexane and n-nonane covering different compositions were calculated using these methods which require only critical properties and the normal boiling point as input data. The predictions were compared with accurate experimental data in the literature. Highly satisfactory results were obtained. The percent average absolute deviations amount to 1.2 and 0.9% utilizing the empirical and semi-theoretical viscosity methods, respectively, for 27 data points.