On continuum modeling using kinetic-frictional models in high shear granulation

摘要

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.