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Modélisation des transferts de chaleur et de masse dans les caloducs. Contribution à l'analyse des phénomènes d'interfaces intervenants dans les écoulements diphasiques

Abstract : Heat pipes are highly efficient devices thanks to the use of latent enthalpy of a fluid at saturation state characterizing the liquid/vapour phase change. They can transfer heat flux maintaining little temperatures gradients. Thanks to their reliability, their autonomy and their little size, they are more and more used in many applications. The better understanding of physical phenomena interfering in these systems requires an accurate numerical modelling of heat and mass transfers. This thesis particularly focuses on the transfers modelling in two main different technologies: grooved heat pipes and rotating heat pipes. In a first chapter, a general description of heat pipes is exposed. The second chapter focuses on the description of the physical phenomena occurring in such devices. In grooved heat pipes, important part of the heat flux injected goes through a little region called micro-region. It is localized at the top of the grooves in the evaporator. A model of this region is presented where original results are exposed; correlations are notably proposed to characterize precisely this zone in a macroscopic model of evaporator. The model used here is then adapted to the description of heat and mass transfer through the liquid film along a rotating heat pipes. The results obtained permits to show the influence of the different operating conditions on the heat pipe performances. Finally, thanks to software developed by the CEA-Grenoble, Trio U, first characterisations of the behaviour of liquid/vapour interface are done for simple two phase flows. This study will permit, in the future, to complete the previous modellings: the final aim is to develop a complete thermo-hydraulic model of heat pipe.
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Submitted on : Tuesday, February 2, 2010 - 5:14:42 PM
Last modification on : Wednesday, October 20, 2021 - 3:22:07 AM
Long-term archiving on: : Friday, June 18, 2010 - 6:28:03 PM

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  • HAL Id : tel-00452630, version 1

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Rémi Bertossi. Modélisation des transferts de chaleur et de masse dans les caloducs. Contribution à l'analyse des phénomènes d'interfaces intervenants dans les écoulements diphasiques. Sciences de l'ingénieur [physics]. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2009. Français. ⟨tel-00452630⟩

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