Project
Two-phase modelling of dilute fibre suspensions.
Project DescriptionIt is known from experiments that flocs of fibre networks may form or disrupt in certain flows. In the project we try to increase the knowledge how the flocs are formed and disrupted from theoretical considerations. The properties of the final paper are to a large extent influenced by the way the fibre suspension is treated and dewatered in the so called forming unit. An important part of the forming unit is the head box which ejects the suspension into the dewatering stage of the process in form of a wide jet. Two critical components of the headbox is the turbulence generator, which acts to disperse the fibres uniformly in the water, i.e. without flocs, and the following converging channel which produces the thin jet of fibre suspension that will become the final paper sheet. In the converging channel, after the turbulence generator, there is a tendency of the reformation of flocs which will appear as a non-uniformity of the produced paper sheet . For paper manufacturing the increased knowledge of how these two components work and interact is of fundamental importance, and the project therefore focuses on this. The goal is to refine existent fibre flocculation models and to develop a computational tool that can be validated against experiments and predict the flocculation process in a headbox. The work is expected to result in a doctoral degree.
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