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**Harvard**

Khalilitehrani, M., Abrahamsson, P. och Rasmuson, A. (2013) *The rheology of dense granular ﬂows in a disc impeller high shear granulator*.

** BibTeX **

@article{

Khalilitehrani2013,

author={Khalilitehrani, Mohammad and Abrahamsson, Per and Rasmuson, Anders},

title={The rheology of dense granular ﬂows in a disc impeller high shear granulator},

journal={Powder Technology},

issn={0032-5910},

volume={249},

pages={309-315},

abstract={The aim of the present study is to evaluate the new approach to dense particulate systems proposed by Jop et al. [1],
in the dense regions of a High Shear Granulator (HSG). Wet granulation in high shear mixers is a common process
in pharmaceutical technologies and a good understanding of the local mixing and ﬂow patterns is a pre-requisite
for this step. In the aforementioned model a dense granularﬂow is characterized as a visco-plasticﬂuid. Therefore
the local rheology of the system can be predicted assuming averaged and virtual properties and a constant solid
volume fraction.
A simple disc impeller granulator with glass spheres was chosen for this study. The dynamics of the system have
been studied using several techniques including PIV analyses, CFD simulation and image processing. The ﬂow
behaviour has been characterized for various impeller speeds and particle loads. Several cases have been analyzed
from different aspects both in experiments and through equivalent simulations to evaluate the validity of the
model in these particular applications.
Results look promising in spite of the simplicity of the model. The model was found to give a good general
description of the ﬂow ﬁeld and bed shape. On the other hand the model is insufﬁcient in some aspects; mostly
related to the regions with low volume fraction. The next step would be to combine the model with conventional
models on rapid granular ﬂow such as Kinetic Theory of Granular Flows (KTGF).},

year={2013},

keywords={High shear granulation; Rheology; Dense granular flows; Disc impeller},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 183833

A1 Khalilitehrani, Mohammad

A1 Abrahamsson, Per

A1 Rasmuson, Anders

T1 The rheology of dense granular ﬂows in a disc impeller high shear granulator

YR 2013

JF Powder Technology

SN 0032-5910

VO 249

SP 309

OP 315

AB The aim of the present study is to evaluate the new approach to dense particulate systems proposed by Jop et al. [1],
in the dense regions of a High Shear Granulator (HSG). Wet granulation in high shear mixers is a common process
in pharmaceutical technologies and a good understanding of the local mixing and ﬂow patterns is a pre-requisite
for this step. In the aforementioned model a dense granularﬂow is characterized as a visco-plasticﬂuid. Therefore
the local rheology of the system can be predicted assuming averaged and virtual properties and a constant solid
volume fraction.
A simple disc impeller granulator with glass spheres was chosen for this study. The dynamics of the system have
been studied using several techniques including PIV analyses, CFD simulation and image processing. The ﬂow
behaviour has been characterized for various impeller speeds and particle loads. Several cases have been analyzed
from different aspects both in experiments and through equivalent simulations to evaluate the validity of the
model in these particular applications.
Results look promising in spite of the simplicity of the model. The model was found to give a good general
description of the ﬂow ﬁeld and bed shape. On the other hand the model is insufﬁcient in some aspects; mostly
related to the regions with low volume fraction. The next step would be to combine the model with conventional
models on rapid granular ﬂow such as Kinetic Theory of Granular Flows (KTGF).

LA eng

DO 10.1016/j.powtec.2013.08.033

LK http://dx.doi.org/10.1016/j.powtec.2013.08.033

OL 30