A Comparative Study of Magnetic Resonance Imaging, Electrical Impedance Tomography and Ultrasonic Doppler Velocimetry for Semi-Dilute Fibre Flow Suspension Characterisation

A Comparative Study of Magnetic Resonance Imaging, Electrical Impedance Tomography and Ultrasonic Doppler Velocimetry for Semi-Dilute Fibre Flow Suspension Characterisation

P.M. Faia P. Krochak H. Costa F. Lundell R. Silva F.A.P. Garcia M.G. Rasteiro

Electrical and Computers Engineering Department, Faculty of Sciences and Technology of the University of Coimbra and CEMUC-Centre of Mechanical Engineering, Portugal

Innventia AB, Sweden

Wallenberg Wood Science Centre, Royal Institute of Technology, Sweden

Chemical Engineering Department, Faculty of Sciences and Technology of the University of Coimbra, and CIEPQPF – Research Centre on Chemical Process and Forest Products, Portugal

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Experimental comparisons between imaging techniques serve to provide confidence in the validity of each technique for the study of multiphase flow systems. Such cross-validation can establish the limitations of each technique quantitatively. In the present paper, the authors report efforts made on the characterization of semi-dilute, mono-dispersed suspensions of rayon fibres in turbulent water flow using Magnetic Resonance Imaging (MRI), Ultrasound Velocity Profiling (UVP) and Electrical Impedance Tomography (EIT). Increasing flow velocities and fibre concentration were studied using these three experimental techniques. For lower fibre concentrations more uniform distributions were observed and as flow velocity increased fibre agglomerations were found in the centre region of the pipe.


EIT, industrial tomography, MRI, semi-dilute fibre suspensions, spatial distribution of phases, UVP


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