Fractionation of Fibre Pulp in a Hydrodynamic Fractionation Device Fractionation of Fibre Pulp in a Hydrodynamic..
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Effect of long fibre concentration on low consistency refining of mechanical pulp
The aim of this study was to investigate the influence of long fibre concentration on loadability and pulp properties during LC refining of mechanical pulp. Long fibre concentration was adjusted to three different levels by screen fractionation of the pulp. The three pulps were refined in a single disc pilot scale LC refiner at similar process conditions. Increased long fibre concentration supp...
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Three methods for improved deresination of sulphite pulps were evaluated, namely, alkaline washing, enzyme treatment, and pulp fractionation. Alkaline washing appears to come at a high cost, because caustic is expensive and affects cellulose chain length, as indicated by lower viscosity of the pulps. Thus this is not a viable option for pulps that are sensitive to changes in viscosity. Enzyme t...
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We investigate the dynamics of a flexible, elastic fibre, suspended in a fluid and subjected to a 3D shear flow. Simulations are performed using the “Immersed Boundary Method,” and are distinguished by their ability to capture the hydrodynamic interaction between the fluid and fibre, as well as the detailed structure of the individual fibres. Suspensions of flexible fibres are encountered in ma...
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We show that mas s fractionation occurs during the course of hydrodynamic escape of gases f rom the a tmosphe re of an inner planet. Light gases escape more readily than heavy gases. The resul tant fract ionat ion as a funct ion of mas s yields a linear or concave downward plot in a graph of logari thm of remaining inventory against a tomic mass . An episode of hydrodynamic escape early in the ...
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