Rheological and flocculation analysis of microfibrillated cellulose suspension using optical coherence tomography
|Author:||Koponen, Antti I.1; Lauri, Janne2; Haavisto, Sanna3,4;|
1VTT Technical Research Centre of Finland Ltd., P.O. Box 1603, FI-40101 Jyväskylä, Finland
2Optoelectronics and Measurement Techniques Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
3Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyväskylä, Finland
4Spinnova Ltd., Palokärjentie 2-4, 40320 Jyväskylä, Finland
|Online Access:||PDF Full Text (PDF, 9.6 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2018092436427
Multidisciplinary Digital Publishing Institute,
|Publish Date:|| 2018-09-24
A sub-micron resolution optical coherence tomography device was used together with a pipe rheometer to analyze the rheology and flocculation dynamics of a 0.5% microfibrillated cellulose (MFC) suspension. The bulk behavior of the MFC suspension showed typical shear thinning (power-law) behavior. This was reflected in a monotonously decreasing floc size when the shear stress exceeded the yield stress of the suspension. The quantitative viscous behavior of the MFC suspension changed abruptly at the wall shear stress of 10 Pa, which was reflected in a simultaneous abrupt drop of the floc size. The flocs were strongly elongated with low shear stresses. With the highest shear stresses, the flocs were almost spherical, indicating a good level of fluidization of the suspension.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
Academy of Finland (project 288694) is gratefully acknowledged for supporting this work.
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).