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  • 1. Claesson, J.
    et al.
    Rasmuson, A.
    Wiklund, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Wikstrom, T.
    Measurement and analysis of flow of concentrated fiber suspensions through a 2-D sudden expansion using UVP2013Inngår i: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 59, nr 3, s. 1012-1021Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ultrasound velocity profiling technique (UVP) was used to study flow structures after a two-dimensional (2-D) 1:11 sudden expansion of pulp fiber suspensions at varied average velocities (1-2.2 m/s) and concentrations (1.8 and 2.8 wt %). One advantage of studying jet geometry is the potential to investigate the main flow structures away from walls. Measurements done at the same percent of the total jet length, at constant concentration, show that an increase in flow rate gave a faster decrease in centerline velocity and a quicker increase in jet width. Increasing the concentration, at the same jet length, the centerline velocity was more stable and the width of the mixing layer increased more rapidly. Comparisons with CFD simulations in the laminar regime, using the Bingham plastic model, show that the main flow structures were captured if the yield stress used in the simulations is approximately 20% of the measured using a rheometer. © 2012 American Institute of Chemical Engineers (AIChE).

  • 2.
    Holmqvist, Claes
    et al.
    RISE., STFI-Packforsk.
    Dahlkild, A.
    Consolidation of sheared, strongly flocculated suspensions2008Inngår i: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 54, nr 4, s. 924-939Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The concept of a particle concentration dependent yield stress, previously employed in studies of uniaxial consolidation of a flocculated solid phase dispersed in a liquid, is extended to comprise flocculated phase shear strength. The inter-particle stresses are modeled by assuming that the stress state is always located on a yield-surface in stress-space, whose form is adopted from the Cam-clay plasticity theory for the quasistatic consolidation of soil. By treating the time-dependent dewatering of a suspension trapped between a permeable filter and a sliding piston, as well as the asymptotic limit of a cross-flow filtration situation, the differences with respect to the conventional uniaxial models are made apparent, and the effects of the shear stresses on the consolidation process are elucidated. Applying shear is predicted to increase the rate of the drainage process, because of a reduced load bearing capacity of the flocculated phase, and the correspondingly higher pore pressures.

  • 3. Wiklund, J.A.
    et al.
    Stading, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Pettersson, A.J.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Rasmuson, A.
    A comparative study of UVP and LDA techniques for pulp suspensions in pipe flow2006Inngår i: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 52, nr 2, s. 484-495Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    For the first time, noninvasive measurements in pulp suspensions at consistencies ranging from 0.74%(w/w) up to 7.8%(w/w) have been performed simultaneously using ultrasound velocity profiling (UVP) and laser doppler anemometry (LDA) in an experimental pipe flow loop. Results show that both techniques can be used to determine the plug flow velocity with good agreement in much more concentrated pulp suspensions than what has been reported so far in the literature. Instantaneous velocity profiles have been obtained noninvasively in pipe flow using the UVP technique, and it is shown that combined with simultaneous pressure drop measurements, the UVP technique can be used to determine the yield stress in-line. Results further show that LDA works, with limited penetration depth of up to several millimeters, even in strongly opaque systems, such as in 7.8%(w/w) pulp. Deviating results were however obtained in the near wall region and more work is needed. © 2005 American Institute of Chemical Engineers.

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