Fibre orientation and related head-box optimization systems
Fibre orientation and related head-box optimization systems
Fibre orientation and related head-box optimization systems
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Mod del complexity<br />
Conclusion: Different Modelling<br />
Approaches for Different Purposes<br />
<strong>Fibre</strong><br />
<strong>orientation</strong><br />
− One-phase model (pure water)<br />
− Meter-scale phenomena in<br />
<strong>head</strong><strong>box</strong><br />
− Routine CFD analyses<br />
Flocculation<br />
− Rheological model (effective medium)<br />
− Head losses in pipes, stock<br />
preparation processes, MC,..<br />
− No large concentration variations<br />
−<br />
−<br />
Passive scalar (one-way coupling)<br />
− Dilute suspensions<br />
− <strong>Fibre</strong> <strong>orientation</strong> probability distr.<br />
Two-phase flow (two-way coupling)<br />
− Carrying phase (water) <strong>and</strong><br />
dispersed phase (fibres or flocs)<br />
h<strong>and</strong>led separately<br />
− Concentration variations, slip<br />
velocity between the phases,...<br />
Nancy, 13-14 October, 2011 www.lut.fi/ceid 11<br />
"Model reality"
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