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  • 1.
    Håkansson, Andreas
    Kristianstad University, Faculty of Natural Science, Research Environment Food and Meals in Everyday Life (MEAL). Kristianstad University, Faculty of Natural Science, Avdelningen för mat- och måltidsvetenskap.
    Flow pulsation plays an important role for high-pressure homogenization in laboratory-scale2018In: Chemical engineering research & design, ISSN 0263-8762, E-ISSN 1744-3563, Vol. 138, p. 472-481Article in journal (Refereed)
    Abstract [en]

    Most experimental and numerical investigations of high-pressure homogenizers assume that the valve is fed with a constant flowrate. However, technical homogenizers use piston pumps with either 3 or 5 pistons (production- and pilot-scale machines) or a single piston (laboratory-scale machines). This results in flow pulsation. It is still unknown to what extent this influences valve hydrodynamics. Moreover, it is unknown if the difference in the number of pistons has implications for scale-up. This study uses a piston pump model and CFD simulations to elaborate on these questions. It is concluded that the constant flow assumption is justifiable for homogenizers using piston pumps with 3 or 5 pistons (pilot-and production-scale), but that homogenizers run with a single piston (i.e. laboratory-scale machines) will obtain a substantially different flow field. Most notably, the jet extending from the single-piston homogenizer gap will become highly unsteady and smaller drop sizes are expected (when keeping all other settings constant). This adds to previous findings suggesting substantial fundamental differences between laboratory- and production-scale homogenizers. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

  • 2.
    Mortensen, Hans Henrik
    et al.
    Tetra Pak Processing Systems AB.
    Innings, Fredrik
    Tetra Pak Processing Systems AB & Lund University.
    Håkansson, Andreas
    Kristianstad University, Research Environment Food and Meals in Everyday Life (MEAL). Kristianstad University, School of Education and Environment, Avdelningen för Mat- och måltidsvetenskap.
    The effect of stator design on flowrate and velocity fields in a rotor-stator mixer: an experimental investigation2017In: Chemical engineering research & design, ISSN 0263-8762, E-ISSN 1744-3563, Vol. 121, p. 245-254Article in journal (Refereed)
    Abstract [en]

    Rotor-stator mixers (RSMs) are available in different designs, e.g. with different number of stator slots and slot dimensions. However, the relationship between stator design and the RSM hydrodynamics is not well understood. Consequently, manufacturers still base design and stator screen recommendations on trial-and-error.

    This study reports experimental measurements of how the flowrate through the stator slots, and velocity profiles in the region of relevance for mixing and breakup, is influenced by the stator slot width, using particle image velocimetry. It is concluded that the flowrate can be described by a design dependent flow number for all investigated geometries and that the flow number decreases with increasing slot width. Moreover, by studying the velocity profiles at different rotor speeds and designs, it is concluded that the velocity profile, its skewness and the proportion of back-flow (fluid re-entering the slot) scales with the flow number of the design. This suggests that the flow number, in addition to rotor speed, is a highly relevant parameter for describing the effect of design on batch RSM hydrodynamics.

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