Numerical and Experimental Study of Deposition of Polystyrene Particles in Multiphase Pipe Flows
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Solid particle deposition on surfaces occur in various industries. Although particle
deposition may be benecial in some industries where processes such as spray
coating or ltration is essential, for many other industries particle deposition is
seen as a problem and poses a challenge. Deposited particles often block process
equipment, pipelines etc. In order to alleviate this problem it is important to
understand why and how particles deposit and what factors in uence the deposition
behaviour of particles. Years of research have been dedicated to accumulate
knowledge about particle deposition.
In this thesis the deposition of spherical Polystyrene particles with a diameter of
100m was studied in a ow cell containing an obstruction. The in uence of the
ow and the particle properties such as the Reynolds number, the work of cohesion/
adhesion, the Adhesion parameter and the Tabor parameter (determines the
particle stiness) were investigated by numerical simulations using a commercial
computational uid dynamics software called STAR-CCM+ as well as laboratory
The discrete element model coupled with the Lagrangian multiphase model was
used to simulate the eects of variations of the Reynolds number, the Adhesion
parameter and the Tabor parameter and the results were analysed and discussed.
Laboratory experiments were also carried out by varying the Reynolds number values
to validate the results from the simulations. The results from the simulations
were found to be in agreement with the results from the laboratory experiments.
Moreover, a literature review was carried out to validate the ndings and they
were found to be in good agreement with the simulation and laboratory experiment
observations in this study.

Monday, June 1, 2015
Author Name: 
Fasil Ayelegn TASSEW