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**Harvard**

Jareteg, A. (2014) *Investigation of stresses in a Couette shear cell using Discrete Element Modeling*. Göteborg : Chalmers University of Technology (Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, nr: 2014:63).

** BibTeX **

@mastersthesis{

Jareteg2014,

author={Jareteg, Adam},

title={Investigation of stresses in a Couette shear cell using Discrete Element Modeling},

abstract={Granular
flows are frequently seen in industry today but their complex nature makes it difficult to formulate
general macroscopic governing relations. Effort has therefore been given to investigate these
flows on detailed
microscopic level and from that draw conclusions of the corresponding macroscopic behavior.
In this project, a Discrete Element Modeling (DEM) method is used to simulate dry granular
flow in a
Couette geometry. The system is dense with particle volume fractions of up to α = 0:81. To accurately describe
contact forces on the particles a soft-sphere model is used. Macroscopical system stresses are formulated based
on the forces on each particle. Shear stresses are evaluated as a function of characteristic properties of the
system, including volume fraction, the shear rate and particle friction.
Clear trends on magnitude of the stresses are found for all considered properties. A higher volume fraction,
shear rate or friction are shown to result in higher stress levels in the system. Further, tendencies on shear
stress related to average normal stress are shown for volume fraction. Where a higher volume fraction results
in a relatively lower shear stress.
To investigate the presence of mono sized or of particles of different size in the system, a bimodal distribution
of particle sizes is compared to a single size setup. For the distributed particle size calculations the stress
magnitude coincide with the single size simulation, whereas the shear to normal stress ratios decrease faster
in radial direction from the inner ring.},

publisher={Institutionen för tillämpad mekanik, Strömningslära, Chalmers tekniska högskola},

place={Göteborg},

year={2014},

series={Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2014:63},

keywords={Granular flow, DEM, Couette device},

}

** RefWorks **

RT Generic

SR Electronic

ID 205035

A1 Jareteg, Adam

T1 Investigation of stresses in a Couette shear cell using Discrete Element Modeling

YR 2014

AB Granular
flows are frequently seen in industry today but their complex nature makes it difficult to formulate
general macroscopic governing relations. Effort has therefore been given to investigate these
flows on detailed
microscopic level and from that draw conclusions of the corresponding macroscopic behavior.
In this project, a Discrete Element Modeling (DEM) method is used to simulate dry granular
flow in a
Couette geometry. The system is dense with particle volume fractions of up to α = 0:81. To accurately describe
contact forces on the particles a soft-sphere model is used. Macroscopical system stresses are formulated based
on the forces on each particle. Shear stresses are evaluated as a function of characteristic properties of the
system, including volume fraction, the shear rate and particle friction.
Clear trends on magnitude of the stresses are found for all considered properties. A higher volume fraction,
shear rate or friction are shown to result in higher stress levels in the system. Further, tendencies on shear
stress related to average normal stress are shown for volume fraction. Where a higher volume fraction results
in a relatively lower shear stress.
To investigate the presence of mono sized or of particles of different size in the system, a bimodal distribution
of particle sizes is compared to a single size setup. For the distributed particle size calculations the stress
magnitude coincide with the single size simulation, whereas the shear to normal stress ratios decrease faster
in radial direction from the inner ring.

PB Institutionen för tillämpad mekanik, Strömningslära, Chalmers tekniska högskola,

T3 Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2014:63

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/205035/205035.pdf

OL 30