Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow

descriptionPublicationkeyboard_double_arrow_right Conference object , Article 01 Jan 2019 Finland English Publisher:ZenodoJournal:Annual transactions of the Nordic Rheology Society, volume 27, pages 13-20 (issn: 1601-4057,

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Authors: Koponen, Antti; Haavisto, Sanna; Salmela, Juha; Kataja, Markku;

doi: 10.5281/zenodo.3338084 , 10.5281/zenodo.3338083

Slip flow and wall depletion layer of microfibrillated cellulose suspensions in a pipe flow

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Abstract

Rheological properties and boundary layer flow behaviour of Micro Fibrillated Cellulose (MFC) suspended in water was studied using Ultrasound Velocity Profiling (UVP) and Optical Coherence Tomography (OCT). The high-resolution OCT provided velocity profiles near the transparent tube wall, while UVP yielded corresponding information in the interior parts of the flow. The results from interior part of the flow showed typical power law shear thinning behaviour of MFC suspension. Close to the wall the suspension was found to have strong (apparent) slip flow associated with depletion of MFC particles from the wall. In this thin depletion layer the consistency and the viscosity of the suspension decrease rapidly with decreasing distance from the wall. In the immediate vicinity of the wall the viscosity of the suspension was found to be close to that of pure water.

This work is a part of the Academy of Finland's Flagship Programme under Project No. 318891.

Country

Finland

Related Organizations

University of Jyväskylä
Finland
VTT Technical Research Centre of Finland
Finland
SPINNOVA OYJ
Finland
University of Jyväskylä
Finland

Keywords

Wall Slip, Ultrasound Velocity Profiling, Microfibrillated Cellulose Suspension, Boundary Layer, Optical Coherence Tomography, Rheology, Ultrasound Velocity Profiling, Microfibrillated Cellulose Suspension

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