1. Online measurement of floc size, viscosity, and consistency of cellulose microfibril suspensions with optical coherence tomography

    Online measurement of floc size, viscosity, and consistency of cellulose microfibril suspensions with optical coherence tomography

    In this study, cellulose microfibril (CMF) suspensions were imaged during pipe flow at consistencies of 0.4%, 1.0%, and 1.6% with optical coherence tomography (OCT) to obtain images of the structure and the local velocity of the suspension. The viscosities obtained by combining pressure loss measurement with the OCT velocity data showed typical shear thinning behavior and were in excellent agreement with viscosities obtained with ultrasound velocity profiling. The structural OCT images were used to calculate the radial and the axial floc sizes of the suspension. A fit of power law to the geometrical floc size–shear stress ...

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