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A model for flexible fibers in viscous and inert fluid
Mid Sweden University. (FSCN)ORCID iD: 0000-0002-1503-8293
2007 (English)In: International Paper Physics Conference, 2007, 23-28 p.Conference paper (Refereed)Text
Abstract [en]

A model is proposed for simulating the motion of flexible fibers in fluid flow. Care has been taken to include typical papermaking conditions into the validity range of the model. Fibres are modeled as chains of fiber segments, whose motion is governed by Newton’s second law. The fluid motion is calculated from the three-dimensional incompressible Navier-Stokes equations. By enforcing momentum conservation, the two-way coupling between the solids and fluid phase is taken into account. Fiber–fiber interactions as well as self-interactions include normal, frictional and lubrication forces. Furthermore, the model considers nonlaminar fiber–fluid interactions and particle inertia. Simulation results were compared with experimental data found in the literature. The model predicts very well the orbit period of rigid fiber motion in shear flow. Quantitative predictions were made for the amount of bending of flexible fibers in shear flow. It was also possible to reproduce the different regimes of motion of flexible fibers in shear flow, ranging from rigid motion to coiled motion and self-entanglement.

Place, publisher, year, edition, pages
2007. 23-28 p.
Keyword [en]
Fibers--Analysis; Fluid dynamics--Mathematics; Navier-Stokes equations; Shear (Mechanics)--Measurement;
National Category
Paper, Pulp and Fiber Technology
URN: urn:nbn:se:liu:diva-125218ISBN: 978-09-7574-692-8OAI: diva2:903619
International Paper Physics Conference
Available from: 2016-02-16 Created: 2016-02-16 Last updated: 2016-02-26

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Lindström, Stefan B
Paper, Pulp and Fiber Technology

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