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Ecoulement de fluides thixotropes dans des conduites droites ou présentant des singularités

Abstract : The aim of this study is to put the focus on the interaction between the reorganization of the internal structure of a thixotropic fluid and the velocity field. Three cases were considered : a flow in a straight pipe, an entry flow and a start up flow. Velocity profiles were measured by particle image velocimetry (PIV). A flatness of velocity profiles, large vortex zones and a plug flow were observed. Then, a rheological study was conducted. It shows that a modified Quemada model with a fractional kinetic for the structural parameter l could be used. Moreover, to have a better understanding of the observed phenomenon in the pipe and to generalize the results, numerical simulations were performed. The finite volume code Fluent 4.5 was adapted to deal with thixotropy by adding user defined subroutines. A good agreement between numerical and experimental results was observed. Moreover, the flow development was investigated by the analysis of the structural field.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0188_CORVISIER.pdf
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https://hal.univ-lorraine.fr/tel-01746574
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Submitted on : Thursday, March 29, 2018 - 10:40:32 AM
Last modification on : Friday, February 26, 2021 - 2:46:04 PM

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  • HAL Id : tel-01746574, version 1

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Philippe Corvisier. Ecoulement de fluides thixotropes dans des conduites droites ou présentant des singularités. Autre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10188⟩. ⟨tel-01746574⟩

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