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Influence de la rugosité de surfaces de parois sur les instabilités hydrodynamiques d'un écoulement de Couette-Taylor et de Couette-Taylor-Poiseuille

Abstract : : This work deals with a numerical and experimental study of the Couette-Taylor flow where the geometry contains rough surfaces, in order to detect the effect of these irregularities on the hydrodynamic instabilities. Firstly, we carried out a 3D mumerical simulation study (CFD) in the case of a Couette-Taylor flow without axial flow, but using several types of surface roughness: isotropic roughness (micro-roughness), anisotropic roughness (macro-roughness) and variation of the amplitude as well as the type of macro-roughness. The obtained results clearly show the effect of this roughness on the reorganization of the flow and the development of the hydrodynamic instabilities. Secondly, we were interested to carry out an experimental study of Couette-Taylor-Poiseuille flows, with and without axial flow by using two protocols (direct and reverse). Indeed, the superposition of an axial flow (Poiseuille) with a Couette-Taylor flow can have a significant effect on the reorganization of the basic and already known hydrodynamic instabilities, constituted by Taylor cells. Therefore, the presence of an axial flow can generate the development of vortices or their breakup or disappearance, and can move the Taylor vortices in the same direction or the opposite direction of the imposed axial flow. Experimentally, we started with a qualitative study by visualizing the hydrodynamic instabilities thanks to kalliroscope particles. Thereafter, a quantitative study using PIV and polarography was carried out in order to characterize the flow regimes of the first instabilities (TVF, WVF, MWVF and TN) with or without axial flow. The polarographic method, using simple circular probes, was then used to quantify the local and instantaneous wall shear stress. The PIV allowed to study the WVF, MWVF and turbulent regimes. Different vortices’ detection criteria (vorticity ω and Q criterion) were then developed and used to correctly identify the turbulent structures.
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https://hal-uphf.archives-ouvertes.fr/tel-03373957
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Submitted on : Monday, October 11, 2021 - 5:37:19 PM
Last modification on : Tuesday, October 12, 2021 - 3:44:16 AM

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  • HAL Id : tel-03373957, version 1

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Lamia Gaied. Influence de la rugosité de surfaces de parois sur les instabilités hydrodynamiques d'un écoulement de Couette-Taylor et de Couette-Taylor-Poiseuille. Sciences de l'ingénieur [physics]. Université Polytechnique Hauts-de-France, 2020. Français. ⟨NNT : 2020UPHF0018⟩. ⟨tel-03373957⟩

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