Thesis
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Jul- 2024 -
Keywords : #Absorption, #Cycle moteur, #expérimentation, #Froid, #simulation -
Jun- 2024 -Documents
Summary : Two-phase flow-induced vibrations is a phenomenon that occurs when two-phase gas-liquid flows encounter mechanical systems such as pipes, tubes, or heat exchangers. This dynamic interaction between the fluid flow and the structural components can lead to various types of vibrations, which can have detrimental effects on the integrity and performance of the system.
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Keywords : #CFD, #Faisceau de tubes, #régime d'écoulement, #Vibrations induites par l'écoulement -
Documents
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.
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Documents
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.
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Documents
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…
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Keywords : #Ébullition Nucléée, #microgravité, #Simulation Numérique Directe -
Documents
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…
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Nov- 2023 -Documents
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 ...
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Documents
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 ...
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Keywords : #Calcite, #Champ électromagnétique, #Scaling, #Précipitation, #ultrasons -
Documents
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 ...
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Keywords : #CFD Diphasique, #ébullition, #Emballement thermique, #Flux critique, #Méthode Inverse, #Mini-canal -
Documents
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 ...
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