A dispersion force approach to modelling the effect of lift forces on fibre dispersion |
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Authors: | O. Melander A. Rasmuson |
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Affiliation: | 1. Applied Mechanics, Metso Paper Sundsvall AB, S-851 94 Sundsvall, Sweden;2. Department of Chemical and Biological Engineering, Chalmers University of Technology, S-412 96 Gothenburg, Sweden |
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Abstract: | Wood fibres suspended in air were studied whilst flowing through a throttle. Measurements of volume fraction and velocity were compared with results from a two-fluid model simulation. Results from earlier work have shown that the lift forces acting on the individual fibres are of importance for the dispersion of volume fraction. Since the orientation of the individual fibres cannot be determined, a dispersion force was utilised to model the dispersing effect of the lift forces. The addition of a lift dispersion model significantly improved the agreement between measurement and model data. |
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Keywords: | Particle image velocimetry Fibres Particle transport Computational fluid dynamics Dispersion force Lift force |
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