Analyse expérimentale et par voie de modélisation d'une boucle gravitaire à pompage capillaire multi-évaporateurs

Abstract : Two-phase fluid capillary pumped loop (TFCPL) have been identified as heat transfers alternative solutionsfor thermal control of power electronics, in the context of ground transportation. A special gravityloop has been improved to adapt TFCPL capacity to these new terrestrial constraints. Experimentaland numerical investigations have proved the great potential of this kind of system and lead today toits upcoming industrial use.The aim is now to employ this new system as « thermal busbar ». A new experimental loop withthree parallel evaporators was built to go further into the earlier studies. Thanks to many measurementinstruments, the goal is to define steady and transient thermohydraulic responses to a power solicitationwith a mono- or multi-evaporators loop. Results highlight many coupling between evaporators, reservoirand condenser, especially during strong transient phases. The thermal control of power electronics, withdifferent range of thermal dissipation on several separate areas, is furthermore demonstrated.The developed modeling is based on nodal method. Transient thermohydraulic behaviour of the gravityloop is very well predicted by numerical results during nominal operating, with one or more evaporators.Even if evaporators and reservoir models are still simplified and depend on empirical identifications, theglobal model of the loop proves to be a great design and analysis tool.
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Nicolas Blet. Analyse expérimentale et par voie de modélisation d'une boucle gravitaire à pompage capillaire multi-évaporateurs. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2014. Français. ⟨NNT : 2014ESMA0026⟩. ⟨tel-01127542⟩

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