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Étude théorique et expérimentale de la convection forcée sur plaque plane en régime transitoire

Abstract : This research work treats the convective phenomena in transitory mode. More particularly, it identifies the convective exchange coefficient on a heated plane plate and placed in a rectangular channel. Two analytic models are discussed:The first model is based on the resolution of the heat propagation equation in a plate using the Green functions method. By this method the evolution of penetrating parietal flow in the fluid and the convective exchange coefficient are deduced in a rigorous way. We notice that this coefficient takes very significant values in the vicinity of t = 0 then decreases and tends towards a constant limit value in permanent mode near the values obtained from the correlations used in he literature. The second model is based on the resolution of the fluid energy equation in the case of a heat flow applied to the solid-fluid interface also by using the Green functions method. This original approach allows, by knowing the speed profile in the dynamic boundary layer, to determine the temperature profile in all the fluid and thus the temperatures and the thermal boundary layer. An experimental test bench permitted to identify the necessary limiting conditions for the two analytical models. In this test bench the plane plate is exposed on its lower face to a crenel of flow transmitted by conduction and penetrating in the fluid by the higher face without disturbing the flow. An Infra-red Camera is installed towards the plate in order to record the temperature profile on this face. To avoid modifying the thermal and dynamic boundary layers, no flow measurement system is installed on the higher face of the plate.
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https://hal-uphf.archives-ouvertes.fr/tel-02998504
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Submitted on : Tuesday, November 10, 2020 - 3:20:21 PM
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2007VALE0034_GRINE_ALI.pdf
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  • HAL Id : tel-02998504, version 1

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Ali Grine. Étude théorique et expérimentale de la convection forcée sur plaque plane en régime transitoire. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2007. Français. ⟨NNT : 2007VALE0034⟩. ⟨tel-02998504⟩

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