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Modélisation et analyse des transferts dans les échangeurs à plaques et ailettes à pas décalés : intensification par optimisation géométrique et génération de vorticité

Abstract : This thesis deals with the analysis, intensification and optimization of convective heat transfer in offset strip fins (OSF) heat exchangers used, for example, in the automotive field as water-cooled charge air coolers. Two complementary approaches are carried out in this study: CFD simulations to perform local fine analysis of the flow characteristics and transfer mechanisms, and a nodal type modeling allowing calculation of global aerothermal performance. Over the range of Reynolds numbers considered, different turbulence modeling approaches are implemented and compared: Large Eddy Simulations (LES) and RANS simulations which are usually used. The qualification of the RANS models shows that strong differences, both in the flow structure and at the overall performance evaluation level, may beobserved, depending on the flow regime considered. Then the development of a nodal model is presented. It aims at carrying out rapid optimization of geometries of unconventional OSF heat exchangers. The various optimization scenarios considered show the interest of this approach allowing the evaluation of a large number of geometric configurations. In a last part, an innovative new geometry that generates longitudinal vortices on this type of fins is proposed and studied.
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https://hal-uphf.archives-ouvertes.fr/tel-03358504
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Submitted on : Wednesday, September 29, 2021 - 2:03:36 PM
Last modification on : Friday, October 1, 2021 - 3:07:34 AM

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  • HAL Id : tel-03358504, version 1

Citation

Ephraïm Toubiana. Modélisation et analyse des transferts dans les échangeurs à plaques et ailettes à pas décalés : intensification par optimisation géométrique et génération de vorticité. Thermique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2015. Français. ⟨NNT : 2015VALE0005⟩. ⟨tel-03358504⟩

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