Direct measurement of rheological properties of microfibrillated cellulose using different measurement techniques

Antti Koponen, Juha Salmela, Sanna Haavisto, Ari Jäsberg, M. Kataja, T. Saarinen, A. Sorvari

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Fiber suspensions, such as MFC (Micro Fibrillated Cellulose), are a challenge for conventional rheometers. The cause of these problems is due to rheometer small flow channel dimensions that may restrict flocculation and due to often-questionable assumptions of the fluid behavior in the gap. One can instead use a pipe rheometer in combination with UVP-PD concept (Ultrasound Velocity Profiling - Pressure Difference) where the real flow behavior is used for the rheological analysis of the bulk properties of the suspension. Unfortunately the resolution of UVP is too low for studying near-wall phenomena, such as lubrication layer, that are often very important for understanding the rheology and to upscale the results to industrial flows. To address this problem we have widened the UVP-PD concept with OCT (Optical Coherence Tomography) measurements. This enables us to measure both the bulk and the wall-layer behavior simultaneously. Our results demonstrate the benefits of having direct detailed measurement of the velocity profile inside the rheometer.
Original languageEnglish
Title of host publication9th Annual European Rheology Conference, AERC 2014
Subtitle of host publicationBook of abstracts
Publication statusPublished - 2014
Event9th Annual European Rheology Conference, AERC 2014 - Karlsruhe, Germany
Duration: 8 Apr 201411 Apr 2014

Conference

Conference9th Annual European Rheology Conference, AERC 2014
Abbreviated titleAERC
CountryGermany
CityKarlsruhe
Period8/04/1411/04/14

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Keywords

  • wood fibre
  • rheology
  • viscosity
  • suspension
  • MFC
  • NFC

Cite this

Koponen, A., Salmela, J., Haavisto, S., Jäsberg, A., Kataja, M., Saarinen, T., & Sorvari, A. (2014). Direct measurement of rheological properties of microfibrillated cellulose using different measurement techniques. In 9th Annual European Rheology Conference, AERC 2014: Book of abstracts [68]