Highly Refined Fibers Fluidization

Ari Jäsberg, Samuli Heiskanen, Juan Cecchini, Titta Kiiskinen, Antti I. Koponen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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In this work, highly refined SWBKP furnishes, referred to here as XFC, were studied from the perspective of fiber suspension handling in processing. The rheology of the furnishes was studied with a rotational rheometer using a nonstandard flow geometry to understand the viscosity development at different consistencies and the impact of temperature. The rheological data was used to evaluate the mixing conditions in tanks as well as fluidization conditions in process pipes. For fluidization analysis during pipe flow, two optical methods were implemented, namely Optical Coherence Tomography (OCT) and High-Speed Video (HSV) imaging. OCT was used to determine the small-scale floc structures near the pipe wall where the shear stress is highest and HSV was applied for observing flow instabilities and XFC suspension uniformity at the pipe scale. All these issues can be significant to decide what is the minimum flow rate required for a process pipe to get sufficient fluidization of XFC suspensions.

Original languageEnglish
Title of host publicationTAPPICon 2023
PublisherTAPPI Press
ISBN (Print)9781713877707
Publication statusPublished - 2023
MoE publication typeA4 Article in a conference publication
EventTAPPICon 2023 - Atlanta, United States
Duration: 22 Apr 202326 Apr 2023


ConferenceTAPPICon 2023
Country/TerritoryUnited States


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