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On the continuum modeling of dense granular flow in high shear granulation

Per Abrahamsson (Institutionen för kemi- och bioteknik, Kemisk apparatteknik) ; Srdjan Sasic (Institutionen för tillämpad mekanik, Strömningslära) ; Anders Rasmuson (Institutionen för kemi- och bioteknik, Kemisk apparatteknik)
Powder Technology (0032-5910). Vol. 268 (2014), p. 339-346.
[Artikel, refereegranskad vetenskaplig]

This article addresses the subject of continuum modeling of dense granular flows with an application in high shear granulation. The possible use of continuum models and their ability to reproduce correct dynamics of such flows has been a subject of debate for a long time in the literature, and no consensus has been achieved so far. In this paper, we examine and compare two ways for making it possible to study dense granular flows in a continuum framework: the one that considers the stress tensor of a particulate phase as a sum of frictional and kinetic-collisional terms and the one that is based on modification of transport coefficients of the kinetic theory of granular flow. The latter framework is based on an analogy with molecular systems and how they behave at the phase transition from a liquid to a crystalline state. We show here that the formulation proposed in this work is able to correctly capture the phase transition and coexistence of solid-like and fluid-like phases in dense granular flows. This is in contrast to the model with added friction where the stress-strain dependence is shown to give a qualitatively different behavior compared to experimental data.

Nyckelord: Granular flow; Phase transition; Inelastic; Dense; Shear cell; High-shear granulation

Denna post skapades 2014-11-27. Senast ändrad 2015-12-17.
CPL Pubid: 206772


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk apparatteknik (2005-2014)
Institutionen för tillämpad mekanik, Strömningslära (2005-2017)



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