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A.Roshanzamir, S. I. Green, R. J. Kerekes--In blade forming, as the moving fabrics pass over blades, water is expelled from the gap and pulp fibres are deposited on each fabric. Most previous models of blade gap forming have assumed either a constant drainage resistance of the fibre mat, or a drainage resistance proportional to the amount of fibres deposited on the mat. In this paper a two-dimensional model was developed that describes the early stages of dewatering in which the effect of inertial resistance of the fabric might be important. The average viscous resistance obtained for the same dewatering was employed in another two-dimensional model and then pressure distributions from two models were compared. The simulation shows that the effect of non-Darcy’s Law drainage resistance on the hydrodynamics in a blade gap former is modest and can therefore be neglected.
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