Imaging Particulate Two-Phase Flow in Liquid Suspensions with Electric Impedance Tomography

Faia, Pedro; Silva, R.; Rasteiro, Maria G.; Garcı́a, Fernando; Ferreira, António; Santos, Márcio; Santos, Jaime; Coimbra, A. Paulo

doi:10.1080/02726351.2011.575444

Cited by 17 publications

(25 citation statements)

References 24 publications

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“…Cho et al 46) applied an adaptive mesh grouping method based on fuzzy genetic algorithm to decrease image reconstruction time. Mesh optimisation is also an important step towards higher resolution images 34) . So far, this type of method is most suited for off-line image reconstruction.…”

Section: Non-linear Methodsmentioning

confidence: 99%

“…When using a voltage source, the current supplied to the system increases as the fluid conductivity increases. This is particularly important in the case of a highly conductive medium (conductivities above 2 S/m) which is quite frequent in real industrial processes 27,34) .…”

Section: Current Flow Linesmentioning

confidence: 99%

“…The authors have also been working on the improvement of EIT applied to image acquisition of two-phase flows (solid/liquid) with the aim of CFD model validation 34) . The EIT system developed by them measures the differences in both the real and imaginary parts of the impedance, so no data is lost.…”

Section: Two-phase Flow Tomography By Eit: Current Developmentsmentioning

confidence: 99%

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Electrical Tomography: a review of Configurations and Applications to Particulate Processes

Rasteiro

Silva

Garcı́a

et al. 2011

KONA

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Despite decades of research, the study of suspension flows still continues to be a subject of great scientific interest. In the development of accurate models for suspension-related processes, prior knowledge of several flow characteristics is essential, such as spatial distribution of phases, flow regimen, relative velocity between phases, etc. Several non-invasive techniques of flow characterisation can be found in the literature, however, electrical tomography offers a vast field of possibilities due to its low cost, portability and, above all, safety of handling. In this paper, a review of the use of electrical tomography for industrial/process monitoring purposes will be presented, giving information about the evolution throughout the years and about the limitations and advantages of the different configurations. Moreover, the signal de-convolution strategies, to obtain the images of the process, will also be discussed. The most recent advances in both fields will be presented. Additionally, information about the strategy adopted by the authors to produce a portable EIT system will be described. Finally, the future challenges for electrical tomography will be addressed.

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Section: Non-linear Methodsmentioning

confidence: 99%

Section: Current Flow Linesmentioning

confidence: 99%

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Electrical Tomography: a review of Configurations and Applications to Particulate Processes

Rasteiro

Silva

Garcı́a

et al. 2011

KONA

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“…The UVP hardware was provided by MetFlow and the software, FlowViz, was developed by SIK in Gothenburg, Sweden. The EIT system electronics and control/operation software developed and used by the authors in the present work have already been described in a previously published work [13]: it measures the differences in both the real and imaginary parts of the impedance, so no data are lost. For the depicted tests an EIT test section with 16 titanium electrodes was produced: each electrode has a diameter of 5 mm which were equally spaced around the test section perimeter.…”

Section: Flow Loopmentioning

confidence: 99%

A comparative study of magnetic resonance imaging, electrical impedance tomography and ultrasonic doppler velocimetry for semi-dilute fibre flow suspension characterisation

Faia¹,

Krochak²,

Costa³

et al. 2016

Int. J. CMEM

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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.

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“…Data on pressure drop, flow rate, temperature, samples of the mixture along the vertical radius of the pipe and crude data of the EIT were collected. For the EIT system, a ring with 32 titanium electrodes, 5 mm in diameter, circumferentially and equally spaced, inserted in the acrylic tube, was used (a more comprehensive description can be found in [13,28]). Tests were done with an excitation frequency of 60 kHz, with 2 V peak-to-peak amplitude, and acquiring 1000 frames per second.…”

Section: Introductionmentioning

confidence: 99%

Oil/water flow in a horizontal pipe—dispersed flow regime

Sanstos¹,

Garcı́a²,

Rasteiro³

et al. 2020

Int. J. CMEM

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In multiphase fluid flow, the formation of dispersed patterns, where one of the phases is completely dispersed in the other (continuous medium) is common, for example, in crude oil extraction, during the transport of water/oil mixture.In this work, experimental and numerical studies were carried out for the flow of an oil/water mixture in a horizontal pipe, the dispersed liquid being a paraffin (oil with density 843 kg m −3 and viscosity 0.025 Pa s) and the continuous medium a water solution doped with NaCl (1000 µS. cm −1 ). The tests were made for oil concentrations of 0.01, 0.13 and 0.22 v/v and velocities between 0.9 and 2.6 ms −1 of the mixture. Experimental work was performed in a pilot rig equipped with an electrical impedance tomography (EIT) system. Information on pressure drop, EIT maps, volumetric concentrations in the vertical diameter of the pipe and flow images were obtained. Simulations were performed in 2-dimensional geometry using the Eulerian-Eulerian approach and the k-ε model for turbulence modelling. The model was implemented in a computational fluid dynamics platform with the programme COMSOL Multiphysics version 5.3. The simulations were carried out using the Schiller-Neumann correlation for the drag coefficient and two equations for the viscosity calculation: Guth and Simba (1936) and Pal (2000). For the validation of the simulations, the pressure drop was the main control parameter.The simulations predicted the fully dispersed flow patterns and the pressure drop calculated when using the Pal (2000) equation for the viscosity calculation showed the best fit. The results of the images of the flows obtained by the photographs and simulations were in good agreement.

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Imaging Particulate Two-Phase Flow in Liquid Suspensions with Electric Impedance Tomography

Cited by 17 publications

References 24 publications

Electrical Tomography: a review of Configurations and Applications to Particulate Processes

Electrical Tomography: a review of Configurations and Applications to Particulate Processes

A comparative study of magnetic resonance imaging, electrical impedance tomography and ultrasonic doppler velocimetry for semi-dilute fibre flow suspension characterisation

Oil/water flow in a horizontal pipe—dispersed flow regime

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