Numerical simulation of fiber separation in hydrocyclones
Hydrocyclones are used in the pulp and paper industry to eliminate undesirable particles as well as for fiber fractionation. This current thesis is focused on modeling the performance of hydrocyclone, which can be used to predict and optimize the hydrocyclone design. The computational model deve...
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| Language: | English |
| Published: |
2009
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| Online Access: | http://hdl.handle.net/2429/13335 |
| Summary: | Hydrocyclones are used in the pulp and paper industry to eliminate undesirable
particles as well as for fiber fractionation. This current thesis is focused on modeling the
performance of hydrocyclone, which can be used to predict and optimize the
hydrocyclone design.
The computational model developed in this study consists of two models. The
flow model is a three-dimensional k-e turbulence model. The Navier-Stokes equations are
solved in a curvilinear coordinate system. The Launder correction is used to model the
turbulence in the highly swirling flow. Then the flow model is coupled with a Lagrangian
tracking of solid particles representing the fibers. The fiber model allows for the motion
in three dimensions. Fibers are constituted of ellipsoids and allow for the representation
of flexible behavior. Interaction with the wall is implemented. Separation characteristics
are investigated for different fiber properties and hydrocyclone design parameters.
The predictions of the proposed model are compared with elaborate published
experimental data sets. Good agreement is obtained between the model predictions and
the experimental data. |
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