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Fluid dynamics and flow structures of wood fibres suspended in gas flows

Olof Melander-2006-01-01-Chalmers Publication Library (Chalmers University of Technology)
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TL;DRAbstract

The flow of wood fibres suspended in gas plays a major role in the MDF (Medium Density Fibreboard) production process. Development of machinery in this industry has traditionally been based on experience. Only recently has the use of numerical methods such as CFD (Computational Fluid Dynamics) become an important part of the development process.The ratio between fibre and gas density is large in fibre-gas suspensions. There are large separation effects, which make it necessary to treat the flow of fibre-gas suspensions as multiphase flows.The measurement of concentration is important in multiphase flow. For single phase flows, measurements of pressure and velocity generally provide sufficient information about the flow field but, for multiphase flows, the volume fraction is also an important part of the flow field. In the present work, a method for simultaneous measurement of the concentration and velocity of wood fibres suspended in air was developed. The velocity was measured using P

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The flow of wood fibres suspended in gas plays a major role in the MDF (Medium Density Fibreboard) production process. Development of machinery in this industry has traditionally been based on experience. Only recently has the use of numerical methods such as CFD (Computational Fluid Dynamics) become an important part of the development process.The ratio between fibre and gas density is large in fibre-gas suspensions. There are large separation effects, which make it necessary to treat the flow of fibre-gas suspensions as multiphase flows.The measurement of concentration is important in multiphase flow. For single phase flows, measurements of pressure and velocity generally provide sufficient information about the flow field but, for multiphase flows, the volume fraction is also an important part of the flow field. In the present work, a method for simultaneous measurement of the concentration and velocity of wood fibres suspended in air was developed. The velocity was measured using P

Keywords

Particle image velocimetryMultiphase flowMechanicsFlow (mathematics)Volume fractionMaterials scienceComputational fluid dynamicsVolume (thermodynamics)

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