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Title: Application of flourescent PIV and digital image analysis to measure turbulence properties of solid-liquid stirred suspensions
Authors: Unadkat, Heema
Rielly, Chris D.
Hargrave, Graham K.
Nagy, Zoltan K.
Keywords: Mixing
Multiphase flows
Turbulence
Particle image velocimetry
Phase separation
Issue Date: 2009
Publisher: Elsevier / © The Institution of Chemical Engineers
Citation: UNADKAT, H. ... et al, 2009. Application of flourescent PIV and digital image analysis to measure turbulence properties of solid-liquid stirred suspensions. Chemical Engineering Research and Design, 87 (4), pp. 573-586
Abstract: This study describes an experimental technique which combines Fluorescent Particle Image Velocimetry (FPIV) and digital image analysis, to quantify the hydrodynamics of a solid–liquid suspension stirred by a 45◦ pitched-blade turbine impeller. Soda-lime glass spheres of 1000 m diameter were employed for the dispersed phase, with up to volumetric concentrations of 0.5 vol% in water. The magnitude of the continuous phase mean velocity did not change significantly in the impeller jet or bulk flow, with the addition of up to 0.5 vol% dispersed phase. Turbulence levels of the continuous phase, in terms of rms velocities, turbulent kinetic energy and dissipation rate decreased above particle concentrations of 0.2 vol%, and the level of turbulence suppression remained constant up to 0.5 vol%. Continuous phase integral length scales remained unchanged in the presence of solids. The locally averaged particle concentration field showed high concentrations above and below the impeller and at the corner of the vessel base, extending up to the vessel wall. Particle turbulence levels measured at 0.5 vol% dispersed phase were lower than the corresponding continuous phase.
Description: This article was published in the journal, Chemical Engineering Research and Design [© The Institution of Chemical Engineers ] and the definitive version is available at: http://www.elsevier.com/wps/find/journaldescription.cws_home/713871/description#description
Version: Accepted for publication
DOI: 10.1016/j.cherd.2008.11.011
URI: https://dspace.lboro.ac.uk/2134/4951
ISSN: 0263-8762
Appears in Collections:Published Articles (Chemical Engineering)

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