Application of in-line ultrasound Doppler-based UVP-PD rheometry method to concentrated model and industrial suspensions

Johan Wiklund, Mats Stading

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The in-line ultrasound Doppler-based UVP-PD rheometry method was evaluated for non-invasive, real-time theological 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 theological 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 theology during processing can be monitored in real-time, in-line.
    Original languageEnglish
    Pages (from-to)171-179
    JournalFlow Measurement and Instrumentation
    Volume19
    Issue number3-4
    DOIs
    Publication statusPublished - 2008

    Subject classification (UKÄ)

    • Food Engineering

    Free keywords

    • velocity
    • sound
    • non-Newtonian
    • suspensions
    • in-line rheometry
    • flow profiling

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