Missions

- Consideration of radiative transfers in fluidized beds of concentrated solar processes
- Analysis of the coupling between transport and radiative transfers

Activités

-Implement a method for solving radiative transfers
- Validate the developments made on simple configurations
-Perform numerical simulations in configurations representative of applications to concentrated solar power plants

Compétences

-Numerical simulation
-High performance computing
- Proficiency in C and C++ programming languages
-Fluid mechanics
-Two-phase flows
-Thermal transfers
-Radiative transfers

Contexte de travail

Circulating fluidized beds have exceptional characteristics in terms of transport and mixing, contact between the dispersed phase and the gaseous medium, thermal inertia and wall heat transfer. These characteristics make them very present in the field of energy, particularly for the development of innovative processes that meet the challenges of energy transition. Gas-solid circulating fluidized beds are studied by PROMES as an alternative to heat transfer fluids which are used to transport the heat obtained from solar radiation in concentrated solar power plants, in particular within the framework of the European projects CSP2 and Next-CSP [1 - 4]. In this process, solar radiation is concentrated on vertical tubes within which a gas-particle mixture circulates. Understanding and mastering the flow regimes and the associated heat transfers, currently remain scientific obstacles for the development of this technology. The couplings between the dynamics, the thermal, the two-phase nature of the flow, the wall effects and the radiative transfers make the physics particularly complex. To better understand these couplings, the PROMES laboratory is developing fine numerical methods where fluid-particle interactions are explicitly simulated. The high-performance computing (HPC) code TrioCFD based on a Front-Tracking method has been modified to allow the simulation of solid particles [5]. It has been successfully used to simulate fluidized bed flows with several thousand particles (see Figure 1). However, the current method does not take radiative transfers into account.
The analysis of the technological locks related to the solar application identifies as a priority the development of the coupled simulation of the transport and the transfers of heat by conduction and by radiation in the gas-solid fluidized beds at high temperature. The major scientific challenge concerns the identification of the role of particle-particle and particle-wall radiative transfers through the study of its coupling with hydrodynamics. This development, essential for the application to concentrated solar power plants, has never before been carried out in the context of fine simulations of fluid-particle flow and constitutes a major opening towards multi-physics coupling.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.

Contraintes et risques

This position is located in a sector covered by the protection of scientific and technical potential (PPST) and therefore requires, in accordance with the regulations, that your arrival be authorized by the competent authority of the MESR.