Thesis

Summary : The study of rapid transient boiling is an important issue in the nuclear safety. Such a phenomenon may occur in the case of a RIA (Reactivity Initiated Accident) in the core of a nuclear reactor powerplant, where a power excursion can trigger the formation of a vapour film around the fuel rod, leading to an important rise of the rod temperature and a risk of failure. Some studies in reactor conditions provided transient boiling curves but the modeling lacks of reliability.

Summary : In Pressurized Water Reactors (PWR), the heat released by the nuclear fuel is transferred to the water flowing in the primary circuit, which is pressurized at 150 bar to avoid boiling. However, water can sometimes reach the Onset of Nucleate Boiling (ONB) under accident conditions that can further lead to the Boiling Crisis.

Résumé : La prédiction des transferts de chaleur en ébullition nucléée est un problème ouvert. La CFD permet des simulations a échelle industrielle, mais nécessite des modélisations de ces transferts. Aujourd’hui, les modèles les plus élaborés sont basés sur une…

Résumé : L’utilisation des échangeurs à plaques et ailettes a été élargie aux procédés cryogéniques tels que la liquéfaction du gaz naturel et aux systèmes de réfrigération. Les ailettes les plus utilisées dans ces évaporateurs sont les ailettes décalées. Bien…

Summary : The need to meet the growing demand for cold production, as well as to favor the use of fatal heat as a source of energy are among the main challenges of the energy transition. Absorption machines can be used to address these two problems ...

Summary : In order to study the impact of the heterodyne effect on the formation of mineral deposits from domestic water networks in a heat exchanger, an experimental pilot was set up to test this technology on two types of heat exchangers, plate ...

Summary : This thesis is part of the industrial context of rapid development of electric vehicles, which includes the growing demand for more powerful and compact battery packs. These packs are generally made with lithium-ion battery cells and require a Battery Thermal Management ...

Summary : Intensified heat exchanger reactors are promising technologies in the current industrial context because of their high potential to significantly reduce heat and mass transfer limitations compared to conventional reactors. However, the absence of simulation ...

Summary : This research is based on a numerical and experimental study of the air conditioning of a habitat by a two-phase thermosiphon loop. Homes are subject to climate-related (sunshine) effects that can be severe and difficult to control...

Résumé : Ce travail porte sur la modélisation, la simulation et l'optimisation du couplage entre les réacteurs nucléaires, de type réacteur à eau sous pression et réacteur haute température modulaire, et les procédés de dessalement de type distillation à effets…