Missions

- Consideration of complex particle shapes in fluidized beds of concentrated solar power processes
- Analysis of the coupling between complex particle shapes
- Analysis of heat transfers

Activités

- Perform particle-resolved numerical simulations in configurations representative of applications to concentrated solar power plants
- Perform numerical simulations using the Euler-Euler approach in configurations representative of applications to concentrated solar power plants
- Compare the results obtained
- Perform upscaling modeling

Compétences

- Numerical Simulation
- High-Performance Computing
- Proficiency in C and C++ programming languages
- Fluid Mechanics
- Two-Phase Flows
- Heat Transfer

Contexte de travail

Circulating fluidized beds have exceptional transport and mixing characteristics. They notably benefit from the efficient contact between the dispersed phase and the gaseous medium, the thermal inertia of the particulate phase and excellent wall transfer capacities. These characteristics make them ubiquitous in the energy field, particularly for the development of innovative processes that meet the challenges of the energy transition. Gas-solid circulating fluidized beds are being studied at the PROMES laboratory as an alternative to current heat transfer fluids - which are used to transport heat obtained from solar radiation in concentrated solar power plants. This work has been carried out in particular by the European projects CSP2, Next-CSP and currently P2P [1 - 4] as well as by the ANR SicSun. In this process, solar radiation is concentrated on vertical tubes within which a gas-particle mixture circulates. Understanding and mastering the flow regimes involved, and the associated heat transfers, currently remain scientific obstacles for the development of this technology. The couplings between dynamics, thermals, the two-phase nature of the flow, wall effects and collisions make the physics particularly complex. To better understand these couplings, the PROMES laboratory is developing a multi-scale approach. At the solar receiver scale, Euler-Euler simulations are implemented with the Neptune_CFD software. At the local scale, we implement fine numerical methods where fluid-particle interactions are explicitly resolved. 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.

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