Online measurement of floc size, viscosity, and consistency of cellulose microfibril suspensions with optical coherence tomography
Lauri, J., Haavisto, S., Salmela, J., Miettinen, A., Fabritius, T., & Koponen, A. I. (2021). Online measurement of floc size, viscosity, and consistency of cellulose microfibril suspensions with optical coherence tomography. Cellulose, 28(6), 3373-3387. https://doi.org/10.1007/s10570-021-03745-6
© 2021 the Authors
In this study, cellulose microfibril (CMF) suspensions were imaged during pipe flow at consistencies of 0.4%, 1.0%, and 1.6% with optical coherence tomography (OCT) to obtain images of the structure and the local velocity of the suspension. The viscosities obtained by combining pressure loss measurement with the OCT velocity data showed typical shear thinning behavior and were in excellent agreement with viscosities obtained with ultrasound velocity profiling. The structural OCT images were used to calculate the radial and the axial floc sizes of the suspension. A fit of power law to the geometrical floc size–shear stress data gave the same power law index for all consistencies, suggesting that floc rupture dynamics is independent of consistency. The dependence of viscosity and floc size on shear stress was similar, indicating that the shear thinning behavior of CMF suspensions is closely related to the rupture dynamics of flocs. The results also showed that an apparent attenuation coefficient of the OCT signal can be used to determine the consistency of CMF suspensions. ...
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Additional information about fundingOpen access funding provided by VTT Technical Research Centre of Finland Ltd. The experiments were carried out in a laboratory facility at the University of California, Davis, Department of Food Science and Technology. The authors greatly appreciate the collaboration with UC Davis, in particular with Professor Michael J. McCarthy and Professor Robert L. Powell. Additionally, J. Lauri would like to express his gratitude to Adjunct Professor Alexander V. Bykov for the insightful discussions on the OCT’s signal formation. The work is part of the Academy of Finland’s Flagship Programme under Project No. 318891 (Competence Center for Materials Bioeconomy, FinnCERES). ...
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