Neutron imaging of froth structure and particle motion

Heitkam, Sascha; Rudolph, Martin; Lappan, Tobias; Sarma, Manoj K.; Eckert, Sven; Trtik, Pavel; Lehmann, Eberhard; Vontobel, Peter; Eckert, Kerstin

doi:10.1016/j.mineng.2018.01.021

Cited by 20 publications

(13 citation statements)

References 15 publications

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“…NR, on the other hand, while similar in principle to XR, allows, for some metals, probing much thicker samples and, as such, is a very promising experimental method that should enable broader coverage of the parameter spaces of various liquid metal systems [2,28,29]. While considerable progress has been made outside of the liquid metal context and without MF [30][31][32], only a few advances with some notable exceptions, have been achieved for liquid metal systems using NR, and to our knowledge it has not been used to systematically study the MF effects on bubble flow [2,28,29,[33][34][35][36].…”

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

et al. 2020

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“…Smaller particles could not be identified individually. However, they might accumulate in vertices of the froth structure forming trackable clusters. At the same time, the number of particles and the total gadolinium amount in such clusters cannot be measured.…”

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confidence: 99%

“…0.75 g gadolinium (Gd) particles (sieved, d = 200 – 250 µm) are used as model particles due to their superior attenuation of neutrons. This particle diameter is sufficiently large to ensure trackability . Firstly, the particles were hydrophobized by stirring them for 10 min in a solution of 2 mM NaOl and 10 mM KCl .…”

Section: Methodsmentioning

confidence: 99%

“…This particle diameter is sufficiently large to ensure trackability . Firstly, the particles were hydrophobized by stirring them for 10 min in a solution of 2 mM NaOl and 10 mM KCl . Then, the particles were added to the vessel where they sunk to the bottom and rested on the bubble generator.…”

Section: Methodsmentioning

confidence: 99%

“…In a preliminary measurement campaign , it has been demonstrated that neutron imaging (NI) is capable of determining both the content of water in froth and of tracing single gadolinium particles inside the froth. This technique is now extended towards three‐dimensional tracking of individual particles under realistic froth movement.…”

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confidence: 99%

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Tracking of Particles in Froth Using Neutron Imaging

Heitkam

Lappan

Eckert

et al. 2019

Chemie Ingenieur Technik

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The movement of hydrophobic particles in a rising froth column is investigated. Gadolinium particles are hydrophobized and floated by means of small air bubbles. The generated froth is investigated by neutron imaging. Particles are identified by correlating the resulting radiographs with an artificial template of a typical particle and subsequent scanning for local maxima. The movement of the particles in the froth was analyzed for different froth stabilities, which resulted from various concentrations of the frother sodium oleate. Decreasing froth stability leads to lower superficial vertical particle velocity and to higher horizontal diffusion of particles due to bubble rupture.

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Minimal‐Invasive Method for the Evaluation of Liquid Fractions in Foams with a Point Level Sensor

et al. 2022

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Liquid foams occur whether intentionally or unintentionally across different industrial sectors. The detection of foam and characterization of liquid content currently requires complex measurement methods such as electrical conductivity measurements. This paper presents a novel method for foam detection and characterization of its liquid fraction based on a capacitive level sensor. A correlation between the sensor output signal and defined liquid fractions of dry to wet foam indicated a high accuracy of this sensor technique. Regarding the sensor operation in different liquid solutions, a minimum screw‐in depth is presented. The sensor allows minimal invasive inline measurements in equipment regardless of the wall material and of extreme process conditions, e.g., explosion hazard areas.

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Neutron imaging of froth structure and particle motion

Cited by 20 publications

References 15 publications

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

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

Tracking of Particles in Froth Using Neutron Imaging

Minimal‐Invasive Method for the Evaluation of Liquid Fractions in Foams with a Point Level Sensor

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