Comparison between classical Kelvin-Voigt and fractional derivative Kelvin-Voigt models in prediction of linear viscoelastic behaviour of waste activated sludge.

Autor:	Farno, Ehsan1, Baudez, Jean-Christophe2, Eshtiaghi, Nicky1 Nicky.eshtiaghi@rmit.edu.au
Předmět:	*Wastewater treatment Sewage sludge microbiology Rheology Mathematical models of viscoelasticity Fluid mechanics Mathematical models Education
Zdroj:	Science of the Total Environment. Feb2018, Vol. 613, p1031-1036. 6p.
Abstrakt:	Appropriate sewage sludge rheological models are essential for computational fluid dynamic simulation of wastewater treatment processes, in particular aerobic and anaerobic digestions. The liquid-like behaviour of sludge is well documented but the solid-like behaviour remains poorly described despite its importance for dead-zone formation. In this study, classical Kelvin-Voigt model, commonly used for sludge in literature, were compared with fractional derivative Kelvin-Voigt model regarding their predictive ability for describing the solid-like behaviour. Results showed that the fractional Kelvin-Voigt model best fitted the experimental data obtained from creep and frequency sweep tests. Whereas, classical Kelvin-Voigt could not fit the frequency sweep data as this model is not a function of angular velocity. Also, the Kelvin-Voigt model was unable to predict the creep data at low stresses. [ABSTRACT FROM AUTHOR]
Databáze:	GreenFILE
Externí odkaz:	Zobrazit plný text záznamu Full Text from ScienceDirect