Velocity measurement for two-phase flows based on ultrafast X-ray tomography

Barthel, Frank; Bieberle, Martina; Hoppe, Dietrich; Banowski, Manuel; Hampel, Uwe

doi:10.1016/j.flowmeasinst.2015.06.006

Cited by 36 publications

(12 citation statements)

References 17 publications

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“…This allows live imaging of the granular flow as well as the measurement of axial velocities in the two detector planes. UFXCT has been demonstrated in several previous applications to provide real-time velocity data of granular ensembles [56,57,[62][63][64]. A more detailed description of the UFXCT principle and the ROFEX (ROssendorf fast electron beam x-ray tomography) setup used here can be found in these publications.…”

Section: Experimental Setup and Materialsmentioning

confidence: 99%

High-speed x-ray tomography of silo discharge

et al. 2019

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The outflow of granular materials from storage containers with narrow outlets is studied by means of ultrafast x-ray computed tomography (UFXCT). The used acquisition speed of this tomograph is high enough to allow high-speed recording of two horizontal cross sections (each of them at a rate of 1000 images per second) of the container during the discharge of material. Analyzing space-time plots that were generated from the tomograms, we retrieve velocity profiles and packing structures in the container. We compare hard spherical grains with soft, low-friction hydrogel spheres. Their flow profiles are qualitatively different. While the hard spheres form stagnant zones at the container side walls, the hydrogel spheres with extremely low friction coefficient flow in all regions of the container. Moreover, a shell-like positional arrangement of the soft spheres induced by the container walls is revealed. The results obtained for the flow field structure confirm earlier conclusions drawn from sequences of x-ray tomograms of clogged states.

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Section: Experimental Setup and Materialsmentioning

confidence: 99%

High-speed x-ray tomography of silo discharge

et al. 2019

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“…However, x-ray based techniques are, in general, very constrained by relatively small liquid metal thickness in the beam direction due to intense x-ray attenuation by liquid metals [20][21][22][23][24]. XCT, while offering very high temporal resolution and sufficient phase boundary detection precision, also entails experimental systems that are rather susceptible to applied MF, rendering them hardly applicable to studies of magnetohydrodynamic (MHD) bubble flow [25][26][27].…”

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confidence: 99%

Phase boundary dynamics of bubble flow in a thick liquid metal layer under an applied magnetic field

et al. 2020

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We investigate argon bubble flow in liquid gallium within a container large enough to avoid wall effects. Flow with and without applied horizontal magnetic field is studied. We demonstrate the successful capture and quantification of the effects of applied magnetic field using dynamic neutron radiography and the previously developed and validated robust image processing pipeline, supported by the in silico reproduction of our experiment. Significant reduction of the amplitude of bubble tilt angle variations due to applied horizontal magnetic field is successfully resolved through a 30 mm thick liquid metal layer. Our results clearly show the potential of expanding the range of gas/liquid metal systems that can be studied using downscaled though representative experimental setups.

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“…Then, the phase segmentation was performed by adequate thresholding and the phase fraction profiles as well as velocity profiles were calculated. Barthel et al [15], using the same measurement technique, evaluated velocity profile as well. The slice images were reconstructed, with a spatial resolution of approximately 0.6 mm per pixel and were pre-processed by selecting a region of interest, enhancing contrast and removing background.…”

Section: High Energy Rays Tomographymentioning

confidence: 99%

Computer methods for non-invasive measurement and control of two-phase flows: a review study

Wajman

2019

ITC

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Nowadays, the application of advanced technologies in modern production systems is the main trend of development and technological progress in many industrial sectors. It is due to the still growing trends of energy-saving and production quality enhancement. Wherever in the production process the phase mixture is transported and it is not optimal or not economic, there is a need to develop a system which would be able to prevent any construction disaster, unexpected production line stopping or situation where for reasons of bad flow parameters, the final product is defective. This paper studies various sensors, measurement techniques and computer methods for signal processing and analysis to diagnose and control two-phase flows. Due to the possibility that the invasive measurement disturbs the process and changes it parameters and behavior especially in the location just after the measurement point and simultaneously does not provide any information about these changes it is unreliable for the diagnosis or control. Therefore, the non-invasive techniques commonly used for measurement of flows parameters are described. Depending on the industrial demands many of applications examples for non-invasive two-phase flows measurement and monitoring are given. This description for identifying the flow parameters is divided into features categories of this phenomena as void fraction distribution, velocity profile and flow regime. However, from these methods the high accuracy and short processing time is expected. The continued observation and monitoring of the process abnormalities can provide valuable information about its dynamic state and allow for real-time and automatic monitoring and control. Therefore, the development of advanced process control is one of the most important challenges to keep the flow regime on the given level and for instant and long-term energy saving, quality improvement.

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Velocity measurement for two-phase flows based on ultrafast X-ray tomography

Cited by 36 publications

References 17 publications

High-speed x-ray tomography of silo discharge

High-speed x-ray tomography of silo discharge

Phase boundary dynamics of bubble flow in a thick liquid metal layer under an applied magnetic field

Computer methods for non-invasive measurement and control of two-phase flows: a review study

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