Rheological and Flocculation Analysis of Microfibrillated Cellulose Suspension Using Optical Coherence Tomography

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. Thi...

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Bibliographic Details
Published inApplied sciences Vol. 8; no. 5; p. 755
Main Authors Koponen, Antti I., Lauri, Janne, Haavisto, Sanna, Fabritius, Tapio
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 10.05.2018
Subjects
Cellulose
cellulose microfibrils
flocculation
Flow velocity
Fluids
Measurement techniques
microfibrillated cellulose
optical coherence tomography
Rheology
Shear stress
shear viscosity
Tomography
velocity profile
Yield stress
Finland
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Summary: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.
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ISSN:2076-3417
2076-3417
DOI:10.3390/app8050755