Inheritance of headbox flow vortices in fiber orientation

Petri Jetsu (Corresponding author), Markku Kellomäki

Research output: Contribution to conferenceConference articleScientificpeer-review

Abstract

One of the most important factors affecting fiber orientation is turbulence. Turbulence is created by wall shear and by sudden expansions of the flow channels in the headbox. A lamella is one of the elements generating turbulence in the slice chamber by both of these phenomena. The use of lamellas leads to the formation of coherent flow structures, i.e., vortices. These vortices are believed to inherit in paper as fiber orientation structures. In this work this hypothesis was studied by generating vortices of different size in the paper machine headbox and analyzing both the flow and the orientation fields with a new pathline method. By determining vortex and orientation structure size distributions from pathline images, the inheritance of flow vortices in fiber orientation was quantitatively shown.

Original languageEnglish
Pages241-245
Number of pages5
Publication statusPublished - 2003
MoE publication typeNot Eligible
Event2003 International Paper Physics Conference - Victoria, BC, Canada
Duration: 7 Sep 200311 Sep 2003

Conference

Conference2003 International Paper Physics Conference
CountryCanada
CityVictoria, BC
Period7/09/0311/09/03

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    Jetsu, P., & Kellomäki, M. (2003). Inheritance of headbox flow vortices in fiber orientation. 241-245. Paper presented at 2003 International Paper Physics Conference, Victoria, BC, Canada.