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View article: Spatiotemporal temperature measurements in low-Prandtl-number Rayleigh–Bénard convection at $$\Gamma =5$$
Spatiotemporal temperature measurements in low-Prandtl-number Rayleigh–Bénard convection at $$\Gamma =5$$ Open
We present measurements of temperature fields and flow structures in a liquid metal Rayleigh–Bénard convection at a low Prandtl number, which were carried out for the first time using embedded fiber Bragg grating sensors (FBG) in combinati…
View article: Physical and Numerical Simulation of Supersonic Gas Jets Blown onto a Liquid Sn40Wt Pct Bi Alloy Surface
Physical and Numerical Simulation of Supersonic Gas Jets Blown onto a Liquid Sn40Wt Pct Bi Alloy Surface Open
The impact of an intense gas jet on the surface of a liquid metal bath is investigated by means of laboratory-scale model experiments and computational fluid dynamics (CFD) simulations. The experimental setup comprises a vessel with two to…
View article: Experimental Investigations on the Impact of Operational Conditions on Bubble Dynamics and the Resulting Vibrations in Gas‐Stirred Ladles
Experimental Investigations on the Impact of Operational Conditions on Bubble Dynamics and the Resulting Vibrations in Gas‐Stirred Ladles Open
Vibration measurements provide a promising approach for regulating gas stirring intensity in metallurgical ladles. In this work, vibration measurements are conducted during argon injection into an experimental ladle filled with Sn–40 wt% B…
View article: Impact of fluid flow on the thermal boundary layer dynamics in turbulent liquid metal Rayleigh–Bénard convection
Impact of fluid flow on the thermal boundary layer dynamics in turbulent liquid metal Rayleigh–Bénard convection Open
View article: Experimental Study on the Impact of Traveling Electromagnetic Fields on the Mold Flow in a Slab Caster
Experimental Study on the Impact of Traveling Electromagnetic Fields on the Mold Flow in a Slab Caster Open
Systematic flow measurements are conducted in a 1:6 fluid-dynamic model of the continuous steel slab casting process. The focus is on the impact of various traveling magnetic fields on the flow in the mold. The HZDR mini-LIMMCAST facility …
View article: The DRESDYN precession experiment
The DRESDYN precession experiment Open
The most ambitious project within the DREsden Sodium facility for DYNamo and thermohydraulic studies (DRESDYN) at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is the set-up of a precession-driven dynamo experiment. After discussing the scie…
View article: Design of a Contactless Inductive Flow Tomography system for a large Rayleigh–Bénard convection cell with aspect ratio <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si6.svg" display="inline" id="d1e403"><mml:mrow><mml:mi>Γ</mml:mi><mml:mo linebreak="goodbreak" linebreakstyle="after">=</mml:mo><mml:mn>0</mml:mn><mml:mo>.</mml:mo><mml:mn>5</mml:mn></mml:mrow></mml:math>
Design of a Contactless Inductive Flow Tomography system for a large Rayleigh–Bénard convection cell with aspect ratio Open
View article: Thermal boundary layer dynamics in low-Prandtl-number Rayleigh–Bénard convection
Thermal boundary layer dynamics in low-Prandtl-number Rayleigh–Bénard convection Open
In this experimental study, we explore the dynamics of the thermal boundary layer in liquid metal Rayleigh–Bénard convection, covering the parameter ranges of $0.026 \leq$ Prandtl numbers $(Pr) \leq 0.033$ and Rayleigh numbers ( $Ra$ ) up …
View article: Two-Field Excitation for Contactless Inductive Flow Tomography
Two-Field Excitation for Contactless Inductive Flow Tomography Open
Contactless inductive flow tomography (CIFT) is a flow measurement technique allowing for visualization of the global flow in electrically conducting fluids. The method is based on the principle of induction by motion: very weak induced ma…
View article: Helicity oscillations in Rayleigh–Bénard convection of liquid metal in a cell with aspect ratio of 0.5
Helicity oscillations in Rayleigh–Bénard convection of liquid metal in a cell with aspect ratio of 0.5 Open
In this paper, we present numerical and experimental results on helicity oscillations in a liquid-metal Rayleigh–Bénard convection cell with an aspect ratio of 0.5. While the numerical simulations use the finite volume library OpenFOAM, th…
View article: Helicity oscillations in Rayleigh-Bénard convection of liquid metal in a cell with aspect ratio 0.5
Helicity oscillations in Rayleigh-Bénard convection of liquid metal in a cell with aspect ratio 0.5 Open
In this paper, we present numerical and experimental results on helicity oscillations in a liquid-metal Rayleigh-Bénard (RB) convection cell, with an aspect ratio of 0.5. We find that helicity oscillations occur during transitions of flow …
View article: Uncertainty Quantification of Super-Resolution Flow Mapping in Liquid Metals using Ultrasound Localization Microscopy
Uncertainty Quantification of Super-Resolution Flow Mapping in Liquid Metals using Ultrasound Localization Microscopy Open
Convection of liquid metals drives large natural processes and is important in technical processes. Model experiments are conducted for research purposes where simulations are expensive and the clarification of open questions requires nove…
View article: Top-down crystallization in small planetary bodies: The effect of non-equilibrium and core composition
Top-down crystallization in small planetary bodies: The effect of non-equilibrium and core composition Open
Understanding the crystallization of metallic cores is necessary to constrain the structure and thermal evolution of terrestrial bodies in our solar system and beyond. Core cooling is also closely related to the generation and sustainabili…
View article: Robust Reconstruction of the Void Fraction from Noisy Magnetic Flux Density Using Invertible Neural Networks
Robust Reconstruction of the Void Fraction from Noisy Magnetic Flux Density Using Invertible Neural Networks Open
Electrolysis stands as a pivotal method for environmentally sustainable hydrogen production. However, the formation of gas bubbles during the electrolysis process poses significant challenges by impeding the electrochemical reactions, dimi…
View article: Robust Reconstruction of the Void Fraction from Noisy Magnetic Flux Density using Invertible Neural Networks
Robust Reconstruction of the Void Fraction from Noisy Magnetic Flux Density using Invertible Neural Networks Open
Electrolysis stands as a pivotal method for environmentally sustainable hydrogen production. However, the formation of gas bubbles during the electrolysis process poses significant challenges by impeding the electrochemical reactions, dimi…
View article: Formation of Varying Dendritic Morphologies in a Directionally Solidifying Ga-in-Bi Alloy
Formation of Varying Dendritic Morphologies in a Directionally Solidifying Ga-in-Bi Alloy Open
View article: Oscillatory large-scale circulation in liquid-metal thermal convection and its structural unit
Oscillatory large-scale circulation in liquid-metal thermal convection and its structural unit Open
In Rayleigh–Bénard convection, the size of a flow domain and its aspect ratio $\varGamma$ (a ratio between the spatial length and height of the domain) affect the shape of the large-scale circulation. For some aspect ratios, the flow dynam…
View article: X-ray Imaging of Two-Phase Flow Regimes in a Liquid Metal Swirling Downward Flow With Side Wall Gas Injection
X-ray Imaging of Two-Phase Flow Regimes in a Liquid Metal Swirling Downward Flow With Side Wall Gas Injection Open
The formation and behavior of gas bubbles is experimentally investigated in a liquid metal downward pipe flow, a configuration that largely corresponds to the situation in a submerged entry nozzle (SEN) in the continuous casting process in…
View article: Vibrations Analysis of Bubble Evolution in Liquids of Varying Physical Properties
Vibrations Analysis of Bubble Evolution in Liquids of Varying Physical Properties Open
In recent years there is an attempt to control the gas stirring intensity in metal-making ladles with the aid of vibration measurements. Understanding better the induced vibrations in two-phase flows can substantially improve the existing …
View article: Three-dimensional flow structures in turbulent Rayleigh–Bénard convection at low Prandtl number <i>Pr</i> = 0.03
Three-dimensional flow structures in turbulent Rayleigh–Bénard convection at low Prandtl number <i>Pr</i> = 0.03 Open
In this paper we report on an experimental study focusing on the manifestation and dynamics of the large-scale circulation (LSC) in turbulent liquid metal convection. The experiments are performed inside a cylinder of aspect ratio $\varGam…
View article: In-Bulk Temperature Profile Mapping Using Fiber Bragg Grating in Fluids
In-Bulk Temperature Profile Mapping Using Fiber Bragg Grating in Fluids Open
The capabilities of Fiber Bragg Grating (FBG) sensors to measure temperature variations in the bulk of liquid flows were considered. In the first step of our research project, reported in this paper, we investigated to what extent the use …
View article: Erratum: Collapse of Coherent Large Scale Flow in Strongly Turbulent Liquid Metal Convection [Phys. Rev. Lett. <b>128</b>, 164501 (2022)]
Erratum: Collapse of Coherent Large Scale Flow in Strongly Turbulent Liquid Metal Convection [Phys. Rev. Lett. <b>128</b>, 164501 (2022)] Open
This corrects the article DOI: 10.1103/PhysRevLett.128.164501.
View article: Current Tomography -- Localization of void fractions in conducting liquids by measuring the induced magnetic flux density
Current Tomography -- Localization of void fractions in conducting liquids by measuring the induced magnetic flux density Open
A novel concept of a measurement technology for the localization and determination of the size of gas bubbles is presented, which is intended to contribute to a further understanding of the dynamics of efficiency-reducing gas bubbles in el…
View article: Learning to reconstruct the bubble distribution with conductivity maps using Invertible Neural Networks and Error Diffusion
Learning to reconstruct the bubble distribution with conductivity maps using Invertible Neural Networks and Error Diffusion Open
Electrolysis is crucial for eco-friendly hydrogen production, but gas bubbles generated during the process hinder reactions, reduce cell efficiency, and increase energy consumption. Additionally, these gas bubbles cause changes in the cond…
View article: Controlling solute channel formation using magnetic fields
Controlling solute channel formation using magnetic fields Open
Solute channel formation introduces compositional and microstructural variations in a range of processes, from metallic alloy solidification, to salt fingers in ocean and water reservoir flows. Applying an external magnetic field interacts…
View article: Investigations on Vibrational Interpretations of Bubbles in Metal-Making Processes
Investigations on Vibrational Interpretations of Bubbles in Metal-Making Processes Open
Vibration measurements were carried out using highly sensitive accelerometers in an experimental ladle integrated into the LIMMCAST ( Li quid M etal M odel for Steel Cast ing) facility at HZDR. The model is operated with liquid Sn–40 wt pc…
View article: Oscillatory large-scale circulation in liquid-metal thermal convection and its structural unit
Oscillatory large-scale circulation in liquid-metal thermal convection and its structural unit Open
In Rayleigh-Bénard convection (RBC), the size of a flow domain and its aspect ratio $\varGamma$ (a ratio between the spatial length and height of the domain) affect the shape of the large-scale circulation (LSC). For some aspect ratios, th…
View article: X-ray Particle Tracking Velocimetry in an Overflowing Foam
X-ray Particle Tracking Velocimetry in an Overflowing Foam Open
In mineral processing, froth flotation is based on recovering valuable mineral particles by means of the overflowing froth. Industrial-scale froth flotation cells are typically equipped with optical measurement systems, which monitor the b…
View article: Data publication: Synchronizing the helicity of Rayleigh-Bénard convection by a tide-like electromagnetic forcing
Data publication: Synchronizing the helicity of Rayleigh-Bénard convection by a tide-like electromagnetic forcing Open
Package of raw and refined data underlying the figures of the connected paper. Included is also the software used to generate the figures.
View article: Synchronizing the helicity of Rayleigh–Bénard convection by a tide-like electromagnetic forcing
Synchronizing the helicity of Rayleigh–Bénard convection by a tide-like electromagnetic forcing Open
We present results on the synchronization of the helicity in a liquid-metal Rayleigh–Bénard experiment under the influence of a tide-like electromagnetic forcing with azimuthal wavenumber m = 2. We show that for a critical forcing strength…