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-24-0162
Thesis topic details
Category
Engineering science
Thesis topics
Modeling of droplets entrainment in horizontal an inclined pipes
Contract
Thèse
Job description
The study of flows with a free surface between a liquid and a gas (vapor, air,...) is important in many fields. Under specific conditions, gas can carry liquid droplets generated in pipes. This thesis focuses on the investigation of evaporation in the horizontal and inclined pipes of Pressurized Light-Water Reactors (PWR) prior to the entry of vapor generators during an accident. The prediction of the equilibrium between deposit and detachment of liquid droplets by gas, on - or from - a liquid layer evaporating in close proximity to the wall of these types of pipes, is critical in these configurations. The thesis will begin with a bibliographic review of transition models, as well as empirical or mechanistic models of entrainment, deposit, and droplets diameter in horizontal and inclined pipes. Some experimental campaigns performed at CEA such as REGARD and MHYRESA tests will support the models analysis. In parallel, some digital experiences obtained by local calculations, DNS or CFD scale are planned to simulate the deformation of liquid/gas interfaces. These models will be implemented in the CATHARE 3 (https://cathare.cea.fr ) code system developed by the CEA in collaboration with EDF, Framatome, and the IRSN, with validation on selected experimental tests.
University / doctoral school
Sciences Mécanique, Acoustique, Electronique et Robotique de Paris (SMAER)
Sorbonne Université
Thesis topic location
Site
Saclay
Requester
Position start date
01/09/2024
Person to be contacted by the applicant
CARNEVALI Sofia sofia.carnevali@cea.fr
CEA
DEN/DM2S/STMF/LMES
Bât 454
CEA Saclay, 91191 Gif sur Yvette Cedex
01 69 08 90 34
Tutor / Responsible thesis director
Duchemin Laurent laurent.duchemin@espci.fr
Laurent Duchemin
ESPCI/PMMH
PMMH – UMR 7636
Sorbonne Université
Barre Cassan bat A, 1er étage Case 18
7 Quai Saint Bernard
75005 Paris, France
En savoir plus
https://cathare.cea.fr