Abstract
A rheometric method based on velocity profiling by optical coherence tomography (OCT) was used in the analysis of rheological and boundary layer flow properties of a 0.5% microfibrillated cellulose (MFC) suspension. The suspension showed typical shear thinning behaviour of MFC in the interior part of the tube, but the measured shear viscosities followed interestingly two successive power laws with an identical flow index (exponent) and a different consistency index. This kind of viscous behaviour, which has not been reported earlier for MFC, is likely related to a sudden structural change of the suspension. The near-wall flow showed existence of a slip layer of 2–12 μm thickness depending on the flow rate. Both the velocity profile measurement and the amplitude data obtained with OCT indicated that the slip layer was related to a concentration gradient appearing near the tube wall. Close to the wall the fluid appeared nearly Newtonian with high shear rates, and the viscosity approached almost that of pure water with decreasing distance from the wall. The flow rates given by a simple model that included the measured yield stress, viscous behavior, and slip behavior, was found to give the measured flow rates with a good accuracy.
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Acknowledgments
Academy of Finland (project Rheological Properties of Complex Fluids) is gratefully acknowledged for supporting this work. We also want to thank senior research technician Ulla Salonen for the photograph of the MFC fibers (Fig. 1), and senior scientist Panu Lahtinen for preparing the MFC.
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Lauri, J., Koponen, A., Haavisto, S. et al. Analysis of rheology and wall depletion of microfibrillated cellulose suspension using optical coherence tomography. Cellulose 24, 4715–4728 (2017). https://doi.org/10.1007/s10570-017-1493-5
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DOI: https://doi.org/10.1007/s10570-017-1493-5