Contribution expérimentale à l'étude de la convection thermique en régime laminaire, transitoire et turbulent pour un fluide à seuil en écoulement dans une conduite

Abstract : This work is an experimental contribution to the study of thermal convection in laminar, transitional and turbulent flow of a yield stress fluid through a cylindrical or annular pipe. The fluid used is a neutralized solution of carbopol. For one-dimensional shear flows, the fully established laminar velocity profile of yield stress fluid has a central plug region. According to the pressure and velocity measurements, a delay in transition is observed for the yield stress fluid. The beginning of transition shows up by instabilities in presence of a stable plug flow. This peculiar regime has been found only for the yield stress fluid. Then, turbulent spots, which fill the pipe cross-section, are obtained and compared to that for newtonian fluids. In turbulent flow, only the shear-thinning and elastic effects of the fluids used are observed. Finally, the evolution of the heat transfer coefficient is determined in the different regimes showing the effects of the rheological properties.
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Jorge Peixinho. Contribution expérimentale à l'étude de la convection thermique en régime laminaire, transitoire et turbulent pour un fluide à seuil en écoulement dans une conduite. Autre. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10042⟩. ⟨tel-01748373⟩

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