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Portail > Offres > Offre UMR5519-NATLAW-043 - H/F chercheur "imagerie en lumière visible et par rayons X pour les écoulements diphasiques"

M/F researcher "visible light and X-ray imaging of two-phase flows "

This offer is available in the following languages:
- Français-- Anglais

Date Limite Candidature : mercredi 5 novembre 2025 23:59:00 heure de Paris

Assurez-vous que votre profil candidat soit correctement renseigné avant de postuler

Informations générales

Intitulé de l'offre : M/F researcher "visible light and X-ray imaging of two-phase flows " (H/F)
Référence : UMR5519-NATLAW-043
Nombre de Postes : 1
Lieu de travail : GIERES
Date de publication : mercredi 15 octobre 2025
Type de contrat : Chercheur en contrat CDD
Durée du contrat : 24 mois
Date d'embauche prévue : 1 janvier 2026
Quotité de travail : Complet
Rémunération : between €2,991 and €3,417 gross per month, depending on experience
Niveau d'études souhaité : Doctorat
Expérience souhaitée : 1 à 4 années
Section(s) CN : 10 - Milieux fluides et réactifs : transports, transferts, procédés de transformation

Missions

The ANR CRIOBOIL project aims to study the heat and mass transfer that occurs in cryogenic liquid storage tanks subjected to sloshing during transport. Our objective is to provide a better description of these physical processes as well as practical outcomes such as the prediction and mitigation of the boiling rate in cryogenic fluid storage tanks (such as LNG, LH2, or liquid oxygen), including propellant reservoirs for the space industry. Therefore, this research project aims to extend the findings and scaling laws to these fluids and applications. This objective will be achieved through experimental and numerical means developed within our consortium. Although our fluid of interest is primarily liquid hydrogen, we will conduct experiments using liquid nitrogen as a model fluid for practical and safety reasons, matching the relevant non-dimensional groups, while retaining all the targeted physics, such as the boil-off phenomenon which is also observed for nitrogen.

Activités

The main activity will be to collect a substantial experimental database of the dynamics of the sloshed interface, and the associated bubble encapsulations and droplet creations through fragmentation events. This will rely on advanced imaging techniques as well as in-house optical probes to fully describe the turbulent two-phase flows formed by sloshing liquid nitrogen, with a focus on strong sloshing conditions and in the absence of phase change (controlling the heat flux and pressure conditions) to fully utilize the unprecedent optical access in the cryostat. The sloshing imposed to the cryostat will always be measured using an accelerometer in conjunction to other measurements, which allows to condition a quantity on a given time along the sloshing period (phase-locked measurements).
The main experimental tasks consist in capturing:
- Interface statistics / dynamics and fragmentation, using high-speed back-lit imaging and optical probes, to retrieve temporal dynamics of the interface and the statistics of the interface density and liquid volume fraction.
- Liquid phase velocimetry and bubble populations, using Particle Image Velocimetry and high-speed back-lit imaging.
- Dense turbulent two-phase flows dynamics, using X-ray phase-contrast high-speed imaging at ESRF.
Interactions are planned, in addition to those within the EDT team, with the project partners at CORIA, carrying out numerical simulations and measurements in conditions that include phase change. Regular meetings and reports will be required in the context of this collaboration, in addition to the expected usual scientific production (e.g., journal articles, conference).

Compétences

Expected required:
- Experimental Fluid Dynamics, Two-phase flows, Turbulence, Data and image analysis,
- Writing skills in English, ability to formulate/work on a scientific project,
- Ability to work in a team.

Contexte de travail

Joint Research Unit (UMR 5519) of the Centre National de la Recherche Scientifique (CNRS), and the University Grenoble-Alpes (UGA), LEGI carries out a wide range of research activities with a common ground: fluid mechanics and related transport phenomena.
The person recruited will be assigned to the EDT team. The EDT (Two-phase flows and turbulence) team focuses primarily on the study of model systems, with a limited number of control parameters, with the aim of identifying and characterizing fundamental mechanisms. This approach concerns systems with complex dynamics involving turbulence, inclusions (bubbles, solids, drops, bacteria) and/or interfaces (waves, instabilities, wave turbulence, elastic structures) and their interactions. As regards experimental aspects in particular, in addition to carrying out dedicated experiments, the team is developing various instruments (optical probes, dynamic acoustic correlation, high-resolution imaging, etc.) as well as specific analysis tools (Lagrangian measurements, conditional statistics, etc.).

Contraintes et risques

No risk identified

Informations complémentaires

The candidate must hold a doctorate degree in fluid mechanics.
The contract may be extended.