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Analyse expérimentale du comportement thermo-hydraulique de caloduc oscillant (Pulsating Heat Pipe (PHP) en environnement sévère : Application aux systèmes embarqués

Abstract : The pulsating heat pipe has been studied for more than twenty years, but is, for the time being, only used for the cooling of electronic components. Tbere is currently a keen interest in expanding the use of this technology to the cooling of embedded dissipative equipment. However, despite numerous experimental and numerical studies, the chaotic behavior of an pulsating heat pipe makes it difficult to predict its functioning under conditions never before encountered. Before being able to implement it in a transport-related application,it is necessary to consider the severe conditions that a pulsating heat pipe could encounter in such a context.The present study deals with the experimental validation of the use of a pulsating heat pipe under various severe conditions. For this purpose, a first device is made to observe the behavior of the pulsating heat pipe during temporal variations of the operating conditions observed during a typical flight or during the presence of mechanical vibrations. The pulsating heat pipe thus proves its possible use in this context. Two other devices serve the analysis of performance and operating limits for powers (8.4 kW) and heat flux densities(53 W/cm2) much higher than conventionally observed in the literature. Water is the most favorable fluid at these power levels, compared to pentane and methanol. These two devices also make it possible to observe the behavior during a uniform or non-uniform distribution of the injected thermal power on various hot sources. Parametric studies have been carried out on the various devices for the three working fluids, coupled with infrared visualizations, to deepen the understanding of the influence of the operating conditions: the filling ratio,power distribution and cold source temperature not only significantly influence performance but also the drying limit of the pulsating heat pipe.
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David Dufraisse. Analyse expérimentale du comportement thermo-hydraulique de caloduc oscillant (Pulsating Heat Pipe (PHP) en environnement sévère : Application aux systèmes embarqués. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2017. Français. ⟨NNT : 2017ESMA0007⟩. ⟨tel-02612390⟩

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