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Analyse des structures tourbillonnaires et des mécanismes de transfert thermique dans les échangeurs de chaleur multi-rangs de tubes ailetés : Amélioration et optimisation des performances thermoaérauliques

Abstract : In this thesis, we analyze the flow and convective heat transfer in multi-row plain fin and tube heat exchangers. The aeraulic phenomena that occur in these devices are first highlighted by means of PIV and LDA measurements. A local study of horseshoe vortices production, development, spatial evolution and dissipation is therefore performed. Secondly, Unsteady RANS modeling of the flow is carried out by means of numerical simulations and the results are validated by comparing theflow structure and the vortex dynamics with experimental data. In a third step, the influence of these vortices on heat transfer is highlighted. The thermalhydraulic performances are characterized on the basis of an analysis of synergy between the velocity field, velocity gradients and temperature gradients.The thermal and viscous entropy rate generated in the flow are locally characterized. In a fourth step, an analysis of the influence of the tube pattern on thermalhydraulic performances is performed by considering the first and the second law of thermodynamics. The convective heat transfer and wallviscous friction losses are evaluated as well as thermal and viscous entropy production rates. Finally an overall geometrical optimization process based on the factorial analysis of TAGUCHI is used to select the major parameters that affect the thermalhydraulic performances aiming to optimize the design ofmultirow plain fin-and-tube heat exchangers for HVAC applications in rail transport.
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https://hal-uphf.archives-ouvertes.fr/tel-03420788
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Submitted on : Tuesday, November 9, 2021 - 2:02:51 PM
Last modification on : Tuesday, November 23, 2021 - 9:45:20 AM

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  • HAL Id : tel-03420788, version 1

Citation

J.V. Simo Tala. Analyse des structures tourbillonnaires et des mécanismes de transfert thermique dans les échangeurs de chaleur multi-rangs de tubes ailetés : Amélioration et optimisation des performances thermoaérauliques. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2012. Français. ⟨NNT : 2012VALE0015⟩. ⟨tel-03420788⟩

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