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, L'étude bibliographique a permis de sélectionner le refroidissement par spray comme technique prometteuse pour dissiper des flux de chaleur au-delà de 100 W/cm 2 . Une étude hydraulique, utilisant de l'eau et du HFE7100 comme fluides de refroidissement, nous a permis de valider des modèles permettant de déterminer la taille et la vitesse de gouttes provenant d'une sélection de buses de spray. Pour la partie thermique, nous avons conçu une section d'essais (évaporateur) permettant de pulvériser en spray afin d, Résumé Cette étude concerne l'étude des écoulements diphasiques dans le cadre du refroidissement des composants électroniques en systèmes embarqués
, nous avons isolé le phénomène d'ébullition nucléée dans une configuration en ébullition nucléée avec un élément chauffant identique à celui employé avec le refroidissement par spray. Pour améliorer les échanges thermiques, 6 surfaces avec différentes structurations (macroscopiques, microscopiques et hybrides) ont été sélectionnées. Les résultats de tests avec ces surfaces ont été comparés avec une surface lisse tant pour le refroidissement par spray que, Vu la complexité du système de spray influencé par plusieurs paramètres et phénomènes physiques
avec un refroidissement par spray, les surfaces macrostructurées nous ont permis de dissiper des puissances thermiques de l'ordre de 140 W/cm 2 avec d'importants coefficients de transfert thermique. D'autre part, avec un système de refroidissement par immersion, une des surfaces hybrides a montré être la plus performante ,
, Les résultats reportés dans cette thèse ont permis d'approfondir la compréhension des mécanismes de transfert de chaleur en refroidissement par spray. De même, ils ouvrent la voie à l'étude des améliorations et optimisations du système permettant de l'employer en systèmes embarqués
, Mots-clés : refroidissement diphasique, systèmes embarqués, refroidissement par spray, pool boiling, intensification des surfaces, structures hybrides