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Fibre orientation distribution is essential factor affecting the properties of produced paper. The fibre orientation distribution is mainly determined by the fluid dynamics in the wet-end and in the wire-section of the paper machine. In this work the fibre orientation probability distribution in the paper machine jet-to-wire impingement is studied using modelling. The model used in this work is based on diffusion-convection equation. In addition to the transport of the fibres due to the mean flow, the model includes flow induced rotation of the fibres and randomising turbulence effects. Thus, the purpose of the model is to estimate the effect of the flow dynamics on the development of the fibre orientation probability distribution.

Modelling of fibre orientation probability distribution in the jet-to-wire impingement