On continuum modeling using kinetic–frictional models in high shear granulation--颗粒学报PARTICUOLOGY

Abrahamsson, P. J., Sasic, S., & Rasmuson, A. (2014). On continuum modeling using kinetic–frictional models in high shear granulation. Particuology, 13, 124–127. https://doi.org/10.1016/j.partic.2013.06.001

P.J. Abrahamsson ^a, S. Sasic ^b, A. Rasmuson ^a *

a Department of Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
b Department of Applied Mechanics, Division of Fluid Dynamics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden

10.1016/j.partic.2013.06.001

Volume 13, April 2014, Pages 124-127

Received 26 October 2012, Revised 24 May 2013, Accepted 1 June 2013, Available online 9 July 2013.

E-mail: rasmuson@chalmers.se

Highlights

• The use of kinetic–frictional models in high shear granulation (HSG) was evaluated.

• Dense sheared granular flow in a Couette shear cell was studied.

• Effect of the lack of scale separation was investigated.

• A significant resolution dependence of the stresses was found.

• Results showed that conventional kinetic–frictional models were not adequate for describing HSG.

Abstract

This short communication demonstrates why extreme caution has to be taken when applying conventional kinetic–frictional closures to continuum modeling of high shear granulation (HSG). Conventional models refer to closure laws where the kinetic and frictional stresses are summed up to obtain the total stress field. In the simple, dense, and sheared system of a Couette shear cell, the effect of the lack of scale separation on the model predictions is examined, both quantitatively and qualitatively. It is observed that the spatial resolution has a significant effect on the magnitude of the kinetic and frictional contributions to the solid phase stresses. With this new investigation and previous studies of HSG, it is concluded that conventional kinetic–frictional models are inadequate for continuum modeling of HSG.

Graphical abstract

Keywords

Kinetic theory of granular flow; Frictional stress; Separation of scales; High shear granulation; Couette shear cell

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