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  • 151. Wiklund, J
    et al.
    Johansson, M
    Shaik, J
    Fischer, P
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Hermansson, Ann-Marie
    In-Line Rheological Measurements of Complex Model Fluids using an Ultrasound UVP-PD Based Method2001In: Annual Transactionof the Nordic Rheology Society, Vol. 8/9, p. 128-Article in journal (Refereed)
  • 152. Wiklund, J
    et al.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    In-line ultrasound based rheology of concentrated suspensions2005In: Annual Transactionof the Nordic Rheology Society, Vol. 13, p. 201-Article in journal (Refereed)
  • 153.
    Wiklund, Johan A.
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Pettersson, Anders Johan
    Chalmers University of Technology, Sweden.
    Rasmuson, Anders
    Chalmers University of Technology, Sweden.
    A comparative study of UVP and LDA techniques for pulp suspensions in pipe flow2006In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 52, no 2, p. 484-495Article in journal (Refereed)
    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.

  • 154.
    Wiklund, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik. Lund University, Sweden.
    Birkhofer, Beat H.
    Sika Services AG, Switzerland; ETH Zurich, Switzerland.
    Jeelani, Shaik A.K.
    ETH Zurich, Switzerland.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik. Chalmers University of Technology, Sweden.
    Windhab, Erich J.
    ETH Zurich, Switzerland.
    In-Line rheometry of particulate suspensions by pulsed ultrasound velocimetry combined with pressure difference method2012In: Applied Rheology, ISSN 1430-6395, E-ISSN 1617-8106, Vol. 22, no 4, p. 5-Article in journal (Refereed)
    Abstract [en]

    The in-line rheometer concept based on the combination of the ultrasonic velocity profiling (UVP) technique and pressure difference (PD) measurements was utilized for investigating the influence of particle concentration and size distribution on the rheology of particulate suspensions in pipe flow under realistic industrial process conditions. Well defined model suspensions were used, consisting of 11mm and 90mm diameter polyamide particles suspended in rapeseed oil at concentrations ranging from 1 to 25% by volume. The variation of concentration and particle size distribution had the expected effects on the shear viscositiy of the investigated unimodal and bimodal suspensions. The in-line results showed that the investigated suspensions exhibit Sisko flow behavior and demonstrated that the UVP+PD method can be used to determine the flow behavior of complex fluids and suspensions, even at high solid concentrations, under industrial conditions in-line. The obtained inline results were in good agreement with measurement data obtained using a conventional rotational controlled-stress rheometer. Limitations of commercially available transducer technology were identified and other possible sources of inaccuracy of the UVP+PD method were investigated. Several improvements of the UVP+PD measurement method were proposed.

  • 155.
    Wiklund, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Shahram, I.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Methodology for in-line rheology by ultrasound Doppler velocity profiling and pressure difference techniques2007In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 62, no 16, p. 4277-4293Article in journal (Refereed)
    Abstract [en]

    This paper describes a methodology for measuring rheological flow properties in-line, in real-time, based on simultaneous measurements of velocity profiles using an ultrasound velocity profiling (UVP) technique with pressure difference (PD) technology. The methodology allows measurements that are rapid, non-destructive and non-invasive and has several advantages over methods presented previously. The set-up used here allows direct access to demodulated echo amplitude data, thus providing an option to switch between time domain algorithms and algorithms based on FFT for estimating velocities, depending on the signal-to-noise ratio (SNR) and time resolution required. Software based on the MATLAB® graphical user interface (GUI) has been developed and provides a powerful and rapid tool for visualizing and processing the data acquired, giving rheological information in real-time and in excellent agreement with conventional methods. This paper further focuses on crucial aspects of the methodology: implementation of low-pass filter and singular value decomposition (SVD) methods, non-invasive measurements and determination of the wall positions using channel correlation and methods based on SVD. Measurements of sound velocity and attenuation of ultrasound in-line were introduced to increase measurement accuracy and provide an interesting approach to determine particle concentration in-line. The UVP-PD methodology presented may serve as an in-line tool for non-invasive, real-time monitoring and process control. © 2007 Elsevier Ltd. All rights reserved.

  • 156.
    Wiklund, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Application of in-line ultrasound Doppler-based UVP-PD rheometry method to concentrated model and industrial suspensions2008In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, Vol. 19, no 42067, p. 171-179Article in journal (Refereed)
    Abstract [en]

    The in-line ultrasound Doppler-based UVP-PD rheometry method was evaluated for non-invasive, real-time rheological characterization of complex model- and industrial suspensions. The method is based on the combination of ultrasound velocity profile (UVP) and pressure drop (PD) measurements. Experiments were carried out in pressure driven, steady shear flow at different volumetric flow rates in a flow loop, designed to mimic industrial conditions. Results showed that instantaneous velocity profiles and rheological properties could be monitored in real-time, in-line. A much wider range of model and industrial suspensions was covered compared to what has so far been reported in literature. Investigated suspensions differed in particle sizes, distributions, shapes and suspension characteristics. The agreement was good between shear viscosities measured in-line and off-line using conventional rheometers for particles smaller than the shear gap in the concentric cylinders. The UVP-PD method is applicable to suspensions for which conventional, off-line rheometers fail due to shear gap size restrictions. The UVP-PD method can be a valuable tool for process monitoring since rapid changes in rheology during processing can be monitored in real-time, in-line. © 2007 Elsevier Ltd. All rights reserved.

  • 157.
    Wiklund, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Tragardh, C.
    Monitoring liquid displacement of model and industrial fluids in pipes by in-line ultrasonic rheometry2010In: Journal of Food Engineering, ISSN 0260-8774, E-ISSN 1873-5770, Vol. 99, no 3, p. 330-337Article in journal (Refereed)
  • 158.
    Wiklund, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Trägårdh, C.
    Ultrasound doppler based in-line rheometry for processing applications.2007In: Transactions of the Nordic Rheology Society, Vol. 15, p. 135-139Article in journal (Other academic)
  • 159.
    Wojno, Sylwia
    et al.
    Chalmers University of Technology, Sweden.
    Ahlinder, Astrid
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Altskär, Annika
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Stading, Mats
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.
    Abitbol, Tiffany
    RISE Research Institutes of Sweden, Bioeconomy and Health. EPFL, Switzerland.
    Kádár, Roland
    Chalmers University of Technology, Sweden.
    Percolation and phase behavior in cellulose nanocrystal suspensions from nonlinear rheological analysis2023In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 308, article id 120622Article in journal (Refereed)
    Abstract [en]

    We examine the influence of surface charge on the percolation, gel-point and phase behavior of cellulose nanocrystal (CNC) suspensions in relation to their nonlinear rheological material response. Desulfation decreases CNC surface charge density which leads to an increase in attractive forces between CNCs. Therefore, by considering sulfated and desulfated CNC suspensions, we are comparing CNC systems that differ in their percolation and gel-point concentrations relative to their phase transition concentrations. The results show that independently of whether the gel-point (linear viscoelasticity, LVE) occurs at the biphasic - liquid crystalline transition (sulfated CNC) or at the isotropic - quasi-biphasic transition (desulfated CNC), the nonlinear behavior appears to mark the existence of a weakly percolated network at lower concentrations. Above this percolation threshold, nonlinear material parameters are sensitive to the phase and gelation behavior as determined in static (phase) and LVE conditions (gel-point). However, the change in material response in nonlinear conditions can occur at higher concentrations than identified through polarized optical microscopy, suggesting that the nonlinear deformations could distort the suspensions microstructure such that for example a liquid crystalline phase (static) suspension could show microstructural dynamics similar to a biphasic system.

  • 160. Young, N.W.G.
    et al.
    Wassell, P.
    Wiklund, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Monitoring struturants of fat blends with ultrasound based in-line rheometry (ultrasonic velocity profiling with pressure difference)2008In: International journal of food science & technology, ISSN 0950-5423, E-ISSN 1365-2621, Vol. 43, no 11, p. 2083-2089Article in journal (Refereed)
    Abstract [en]

    Ultrasonic velocity profiling with pressure difference (UVP-PD) was demonstrated to be a successful, non-invasive, in-line measurement system for instantaneous velocity and rheological flow profiling of complex, opaque fat blends. Model systems of 25% Akomic, 75% rapeseed oil; and 25% Akomic, 74% rapeseed oil and 1% Grindsted® Crystalliser 110 were compared under real process conditions with UVP-PD. Results indicated that the sample containing the crystalliser had twice the viscosity of the control. These in-line results are in agreement with previous off-line results, and offer the chance to probe the mechanics of fat blend physics under real, dynamic conditions. © 2008 Institute of Food Science and Technology.

  • 161. Zatti, D
    et al.
    Wiklund, J
    Vignali, G
    Stading, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Determination of velocities profiles in hyperbolic contraction using ultrasound velocity profiling2009In: Annual Transactionof the Nordic Rheology Society, Vol. 17, p. 277-Article in journal (Refereed)
1234 151 - 161 of 161
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