Characterizing rheological behavior and fluidization of highly refined furnishes for process optimization, TAPPI Journal April 2024

 


Application: The results from this study can be used for studying fluidization conditions or dimensioning process pipes for microfibrillated cellulose (MFC) feeding systems.

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Author: A. Jäsberg, S. Heiskanen, J. Cecchini, T. Kiiskinen, and A.I. Koponen
Characterizing rheological behavior and fluidization of high
ABSTRACT: In this work, highly refined softwood bleached kraft pulp (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 non-standard flow geometry to understand the viscosity development at different consistencies and the impact of temperature. For fluidization analysis during pipe flow, two optical methods were implemented; namely, optical coherence tomography (OCT) and high-speed video (HSV) imaging. The OCT was used to determine the small-scale floc structures near the pipe wall where the shear stress is highest, and the HSV imaging was applied for observing flow instabilities and XFC suspension uniformity at the pipe scale. All these issues can be significant in deciding the minimum flow rate required for a process pipe to get sufficient fluidization of XFC suspensions.
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