A5068715442- Metallurgical Processes and Thermodynamics
- Non-Destructive Testing Techniques
- Heat Transfer and Boiling Studies
- Solidification and crystal growth phenomena
- Geomagnetism and Paleomagnetism Studies
- Spacecraft and Cryogenic Technologies
- Fluid Dynamics and Turbulent Flows
- Fluid Dynamics and Thin Films
- Flow Measurement and Analysis
- Fusion materials and technologies
- Heat Transfer and Optimization
- Fluid Dynamics and Mixing
- Magnetic Properties and Applications
- Solar and Space Plasma Dynamics
- Minerals Flotation and Separation Techniques
- nanoparticles nucleation surface interactions
- Mineral Processing and Grinding
- Fluid Dynamics and Heat Transfer
- Additive Manufacturing Materials and Processes
- Chemical and Physical Properties of Materials
- Induction Heating and Inverter Technology
- Force Microscopy Techniques and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Laser and Thermal Forming Techniques
- Phase Equilibria and Thermodynamics
Institut de Mécanique des Fluides de Toulouse
2010-2024
Université de Toulouse
2010-2024
Centre National de la Recherche Scientifique
2010-2024
Institut National Polytechnique de Toulouse
2010-2023
Université Toulouse III - Paul Sabatier
2010-2023
Institut Superieur de l'Aeronautique et de l'Espace (ISAE-SUPAERO)
1991
Office National d'Études et de Recherches Aérospatiales
1991
Pool boiling on flat plates in microgravity has been studied for more than 50 years. The results of recent experiments performed sounding rocket are presented and compared to previous results. At low heat flux, the vertical oscillatory motion primary bubble is responsible increase transfer coefficient ground experiments. effect a non-condensable gas stabilisation large heater pointed out. Experiments isolated bubbles also parabolic flight. shear flow detachment highlighted. A force balance...
A model based on the first order perturbation expansion of magnetic flux in a two-phase liquid metal flow has been developed for low Reynolds number Rem. This takes into account distortion induced eddy currents due to presence void conducting medium. Specific experiments with an current meter have realized two periodic distributions. The results shown, agreement model, that effects velocity and emf modulation are decoupled. magnitude fraction spatial frequency can be determined from spectral...
In this paper, we present the model experiments in order to study magnetic flux distortion of a two-phase liquid metal flow excited by an AC field range pulsation where Faraday induction and Lorentz force effects are significant. These realized with solid aluminum rods allow characterize velocity (0 ≲ U≤1 ms−1), void fraction (0≤α≤6.9 %), (1.5×103≤ω≤12.5×103 rad s−1), two different geometries. The results analyzed on basis first expansion U α. Despite strong coupling between effects, show...
We propose an experimental methodology for the purpose of quantitative void fraction measurements in fourth generation Sodium cooled fast reactors with a standard Eddy Current Flow Meter (ECFM) sensor. The consists using technique ellipse fit and correlate fluctuations angle inclination this fraction. This is applied paper to ideal configuration periodic grooves on solid aluminium cylinder various volumic fractions. effects physical parameters such as coil excitation frequency, current...
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A model has been developed to predict the response of an eddy current flow meter (ECFM) passage a non-conductive inclusion moving in cylindrical tube filled with liquid metal. The can be solved analytically for small diameters and moderate AC frequencies excitation signal. This condition is expressed as vbSω≪1, where vb dimensionless volume Sω function ratio between characteristic length system penetration depth magnetic field. induction equation this problem also numerically. very good...
We investigate convection driven by induction heating of a horizontal fluid layer with direct numerical simulations (DNS).This problem is particular interest in the context nuclear severe accident mastering.In real accident, molten core subjected to homogeneous internal sources resulting from disintegrations.This situation mimicked laboratory using as source.In however, heat are localized skin layer.Consequently, this concentration may modify flow and wall transfer, compared case sources.DNS...
We study the effect of an impressing AC magnetic field at bottom a liquid metal layer thickness $h$. In this situation fluid is set in motion by buoyancy forces caused internal heat sources. The sources, Joule induced field, present exponentially decaying profile, with characteristic length $\ensuremath{\delta}$. As horizontal, Lorentz force has no influence on dynamics system since it contributes only to pressure. propose analysis both transient and fully developed regimes using linear...
Liquid metal subjected to an AC magnetic field experiences Joule heating and Lorentz force. In this paper, we study how the heat transfer departs from natural convection when intensity frequency of increases. Various regimes are identified based on characteristic temperature velocity scales system. From our numerical simulations, scaling relations proposed predict at walls a Rayleigh-B\'enard cell in presence field.
In this paper, we address the problem of characterizing size and position a spherical non-conductive inclusion in conductive material. The characterization is done using an Eddy-Current Flow Meter (ECFM), device usually used to measure flow rate liquid metals, but which also sensitive second gaseous phase. ECFM responses passage inclusions quiescent metal are computed numerically. signal amplitude phase variations analyzed for different radii radial positions travelling pipe. Two parameters...
In this article, we present an analytical model to calculate the perturbation of magnetic vector potential due a non-conducting inclusion in liquid metal translated at constant velocity. The is valid for low Reynolds number, Rem, and shielding parameter, Sω. We establish that first order can be directly obtained from value unperturbed eddy-current calculated location inclusion. An ECFM (Eddy-Current FlowMeter) device has been designed validate study frequency effects volume one its location....
Bubble detection in liquid metal is an important issue for various technological applications. For instance, the framework of Sodium Fast Reactors design, presence gas sodium flow primary and secondary loops crucial importance safety reliability. Here, two main measurement methods are ultrasonic testing eddy-current testing; we investigate second method our study. In a first approach, have performed experiments with galinstan containing insulating spherical beads millimeter size. The probed...
Atomic force microscopy (AFM) experiments were performed to study the behaviour of AFM cantilevers under an external magnetic field B and temperature produced by a coil with iron core.Four cantilever types studied.Forces measured for different values at various coil-to-cantilever separation distances.The results analysed on basis phenomenological model.This model contains contribution two terms, one monopolemonopole interaction short distance, apparent paramagnetic in ∇B 2 large which...
This study was carried out to understand the response of an eddy current type flowmeter in two phase liquid-metal flow. We use technique ellipse fit and correlate fluctuations angle inclination this with void fraction. The effects physical parameters such as coil excitation frequency flow velocity have been studied. results show possibility using a gas detector for large fractions.