Analysis of rheology and wall depletion of microfibrillated cellulose suspension using optical coherence tomography

被引:0
|
作者
Janne Lauri
Antti Koponen
Sanna Haavisto
Jakub Czajkowski
Tapio Fabritius
机构
[1] University of Oulu,Optoelectronics and Measurement Techniques Unit, Faculty of Information Technology and Electrical Engineering
[2] VTT Technical Research Centre of Finland Ltd,Department of Physics
[3] University of Jyväskylä,undefined
[4] Spinnova Ltd.,undefined
来源
Cellulose | 2017年 / 24卷
关键词
Shear viscosity; Yield stress; Lubrication layer; Slip velocity; Velocity profile; Optical coherence tomography;
D O I
暂无
中图分类号
学科分类号
摘要
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.
引用
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页码:4715 / 4728
页数:13
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