When wood is processed into paper a mixture of water and wood fibers is flowing through the production plant. These fiber suspensions (mixtures) are non-Newtonian multiphase fluids with complex flow behaviors. The flow is of vital importance in paper production since it directly relates to the quality of the finished product. Currently, there are no measurement techniques available able to accurately measure these advanced flow characteristics in real-time directly in the production line. The Flow-Viz system was used to measure velocity profiles and complex rheological properties, such as yield stress, directly in-line in highly concentrated paper pulp suspensions.
The acoustic properties, for example the sound velocity can be linked to the concentration of solids. The Figure shows sound velocity as a function of concentration of fibres in pulp suspensions with corresponding linear fit. Measurements were made in-line at 23 ◦C
Our ILR instrument was used to measure velocity profiles, yield stress and viscosity of pulp suspensions. Flow measurements were made in both laminar, transitional and turbulent flow.
Video of a pulp suspension fiber jet
Measured spectra showing velocity distribution in pipe flow
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