General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0122
Thesis topic details
Category
Engineering science
Thesis topics
Modelling of the reactive mixing process for conditioning waste in a concrete matrix
Contract
Thèse
Job description
Cementation is currently the preferred method for conditioning a large number of nuclear wastes. Developing a conditioning process requires to master the mixing and blending phases, which will condition the proper dispersion of the waste in the cement matrix and the performance of the final material.
The LNPA is proposing a thesis on the modeling and simulation of the mixing process (mixing of dry fillers, water, waste simulants representative of nuclear waste deposits) to meet the following objectives:
- Simulate the flow of cementitious paste in the mixer and experimentally verify the results obtained
- Optimize process parameters to improve waste dispersion quality
- Predict coating feasibility based on the characteristics of the waste to be conditioned
- Validate transfer from laboratory to industrial scale
A CFD approach is considered: the aim is to describe the evolution of the free surface of the flow, to highlight specific modes such as recirculation and trajectory bifurcation, and finally to describe particle transport with and without coupling to rheology. The simulation results will be evaluated by cross-checking with tests carried out on a conical mixer. This thesis will therefore be the first step in setting up a predictive sizing tool for a cement mixing process applied to the conditioning of nuclear waste.
The candidate, with a background in materials engineering, mechanical engineering or process engineering, will gain experimental experience in process instrumentation and exploitation of results, as well as experience in numerical fluid mechanics and process modelling.
University / doctoral school
Sciences Fondamentales et Appliquées (EDSFA)
MINES ParisTech
Thesis topic location
Site
Marcoule
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
Marchal Antoine antoine.marchal@cea.fr
CEA
DES/DPME/SEIP/LNPA
CEA Marcoule
BP 17171
30200 Bagnols sur Cèze
0466795712
Tutor / Responsible thesis director
VALETTE Rudy rudy.valette@mines-paristech.fr
MINES-ParisTech, PSL Research University
Centre de Mise en Forme des Matériaux (CEMEF), UMR CNRS 7635
1 Rue Claude Daunesse, CS 10207, 06904 Sophia Antipolis Cedex, France
En savoir plus
https://www.cemef.minesparis.psl.eu/presentation/equipe-cfl/