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Analyse par voie de modélisation du comportement thermohydraulique instationnaire de boucles diphasiques à pompage capillaire en environnement gravitaire: application au refroidissement de composants électroniques de puissance soumis à des sollicitations sévères

Abstract : Electrification of airplane approach lays on the increasing power electronics integration. Traditional cooling systems reach their maximal performance because of the high thermal dissipation of these components. Two-phase fluid capillary pumped loops appear among identified alternative solutions. This thesis aims at proposing a modeling approach of this king of system. A peculiar architecture of two-phase fluid capillary pumped loop, exploiting gravity thanks to relative position between its constitutive components which are the tank, the evaporator and the condenser, is firstly presented. Then a transient modeling approach which relies essentially on nodal method, homogenous fluid hypothesis and phase change management thanks to pressure and mass enthalpy instead of temperature, is proposed. The main weakness of this modeling is not to take into account hydraulic dynamic. Not only experimental validation has revealed the thermal estimation quality but also the incapacity of hydraulic behavior prediction. However, hydraulic phenomenon leads the loop functioning during transient states. Thus, un new model which traduces accurately the mechanical aspects is proposed. It relies on mass conservation, momentum and energy conservation equations solving using finite volumes method. Mass enthalpy, pressure and mass flow rate are considered as variables. Even if refining the evaporator and tank modeling would induce a better accuracy, the ability of this transient modeling to predict to thermohydraulic behavior of the loop is proved soon.
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Submitted on : Thursday, June 30, 2011 - 5:17:18 PM
Last modification on : Wednesday, October 20, 2021 - 3:22:14 AM
Long-term archiving on: : Saturday, October 1, 2011 - 2:30:09 AM

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Nicolas Delalandre. Analyse par voie de modélisation du comportement thermohydraulique instationnaire de boucles diphasiques à pompage capillaire en environnement gravitaire: application au refroidissement de composants électroniques de puissance soumis à des sollicitations sévères. Sciences de l'ingénieur [physics]. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2011. Français. ⟨tel-00605158⟩

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