Imperial College London
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ProfessorVelisaVesovic

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Transport Phenomena
 
 
 
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Contact

 

+44 (0)20 7594 7352v.vesovic

 
 
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Location

 

2.33Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Nguyen:2017:10.1016/j.fuel.2017.07.015,
author = {Nguyen, T-B and Riesco, N and Vesovic, V},
doi = {10.1016/j.fuel.2017.07.015},
journal = {Fuel},
pages = {363--376},
title = {Predicting the viscosity of n-alkane liquid mixtures based on molecular description},
url = {http://dx.doi.org/10.1016/j.fuel.2017.07.015},
volume = {208},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A new model has been developed to predict the viscosity of liquid, n-alkane mixtures. It represents a mixture by a single pseudo-component characterized by an appropriate molecular weight and calculates the viscosity by means of the modified, extended hard-sphere model (EHS) that makes use of an universal function relating reduced viscosity to reduced volume. For mixtures that contain n-alkanes with a similar number of carbon atoms, the molecular weight of the pseudo-component is simply given by the molecular weight of the mixture. For more asymmetric mixtures, the choice of the molecular weight is a function of the difference in the number of carbon atoms, between the longest and the shortest chain. The proposed model is a precursor of a new family of models that do not require the knowledge of detailed composition of the mixture, but still take advantage of the underlying molecular description. The developed model, named 1-component Extended Hard-Sphere (1-cEHS), predicted, in general, the viscosity of binary and multicomponent n-alkane mixtures with uncertainty of 5%, even when the mixtures contain very long n-alkanes. For highly asymmetric binary mixtures of alkanes the predictions deteriorated, but improved for highly asymmetric multicomponent mixtures indicating that the presence of the intermediate alkane species leads to a better prediction.We have also tested two other viscosity models, the extended hard sphere (EHS) and Vesovic-Wakeham (VW), that also rely on kinetic theory to provide the molecular description, but require a full compositional specification of the mixture. They can also predict the viscosity within 5%, but the presence of the long chain n-alkanes in a mixture as well as the high asymmetry, leads to deterioration of the prediction.
AU  - Nguyen,T-B
AU  - Riesco,N
AU  - Vesovic,V
DO  - 10.1016/j.fuel.2017.07.015
EP  - 376
PY  - 2017///
SN  - 1873-7153
SP  - 363
TI  - Predicting the viscosity of n-alkane liquid mixtures based on molecular description
T2  - Fuel
UR  - http://dx.doi.org/10.1016/j.fuel.2017.07.015
UR  - https://www.sciencedirect.com/science/article/pii/S0016236117308682
UR  - http://hdl.handle.net/10044/1/49678
VL  - 208
ER  -
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