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Fibre Floc Evolution Model, Part II: Influence of jet-towire ratio on the resulting fibre floc evolution in the initial drainage zone by Taija Hämäläinen; Jari Hämäläinen is a Engineering article available to read on EtoBox.

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Improving formation, i.e. minimizing small-scale basis weight variation, is one major challenge in the papermaking process. The fibre suspension behaviour, and especially the local floc size, is therefore an important factor in understanding the forming of the fibrous material. To examine the evolution of the local fibre floc size, the Fibre Floc Evolution (FFE) model was used in the initial drainage zone of a Fourdrinier type dewatering section. In the FFE model, the existence of different floc sizes is taken into account as well as their possibility to break up or coalesce with other flocs. In this study, the main effort was directed to the modelling of flocculation and less attention was paid to jet impingement and dewatering. A computationally predicted floc size evolution in the machine direction is given for three different jet-to-wire ratios. When comparing the effect of jet-to-wire ratio on the average floc size, it is noticed that the FFE model predicts smaller flocs for the higher shear flow than for the lower shear. The model seems to predict qualitatively correctly the floc size evolution in paper forming.

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Author

Taija Hämäläinen; Jari Hämäläinen

Publisher

Walter de Gruyter GmbH

Published

2010

Language

EN

Field

Engineering (Physical Sciences)