Modelling the effect of shear flow on fibre orientation anisotropy in a planar contraction
2007 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 22, no 3, 376-382 p.Article in journal (Refereed) Published
The effect of turbulence generating vanes and its location in a planar contraction on fibre orientation anisotropy was studied by mathematical modelling. We use single phase CFD (Computational Fluid Dynamic) modelling as an input for the fibre orientation dispersion model to study the effect of shear flow and turbulence in an accelerated fluid flow on fibre orientation anisotropy. For different streamlines in the contracting channel, the fibre orientation distribution model is solved, and the fibre orientation anisotropy could be studied along streamlines near the vane wall and vane tip and further away downstream. The boundary layer did decrease the fibre orientation anisotropy both in the plane of paper and in the plane of contraction, i.e the fibres were less oriented. For the outlet profile of the contraction the fibre orientation anisotropy was more effected by the blunt vane tip than the tapered one. Experimental results in the literature were used to validate this modelling approach and a good qualitative agreement was achieved.
Place, publisher, year, edition, pages
2007. Vol. 22, no 3, 376-382 p.
fibre; orientation; anisotropy; turbulence; dispersion; modelling
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-8482ISI: 000250025000014ScopusID: 2-s2.0-34948865620OAI: oai:DiVA.org:kth-8482DiVA: diva2:13818
Uppdaterad från konferensbidrag till artikel(20101202).
Tidigare titel: Modelling a turbulent dilute fibre suspension in a planar contraction: Effect of vane types, vane position and wall boundary layer on fibre orientation distribution.2008-05-162008-05-162010-12-02Bibliographically approved