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Analyse du comportement en écoulement à la paroi de polymères dans des conditions de mélangeur interne

Abstract : The internal mixing process is crucial to the manufacturing of rubber compounds as it is detrimental to the final properties of the product. The understanding of the interfacial phenomena during mixing is crucial to the understanding of the process, determination of process parameters and numerical simulation of the process. These phenomena include wall slip, adhesion and movement of free surfaces. The evolution of wall slip velocities was characterized with classical indirect rheological techniques. An eccentric counter-rotating Couette cell was designed and developed during this PhD to observe the free surfaces of viscous fluids under shear flow in steady-state conditions. A small volume of silicone fluid was used to study the flow behavior and observe the free surfaces in counter-rotating conditions. Steady state conditions were investigated for different conditions of cylinder velocities, volumes of fluid, surface roughness and nature of cylinder surfaces. The contribution of the adhesion energy to the stabilization velocities appears to be negligible. Finally, the influence of shear flow on the movement and shape of free surfaces was explored with the help of a finite element simulation. The numerical simulation with the integration of an adhesion boundary condition shows a clear effect of the adhesion energy on the free surface shape and movement. But the level of adhesion energy necessary in the case of viscous fluids is found to be far too high to be observed experimentally.
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Submitted on : Wednesday, September 7, 2022 - 4:35:45 PM
Last modification on : Saturday, October 22, 2022 - 5:13:10 AM


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  • HAL Id : tel-03771834, version 1


Prashanth Thirunavukkarasu. Analyse du comportement en écoulement à la paroi de polymères dans des conditions de mélangeur interne. Mechanics of materials [physics.class-ph]. Université Paris sciences et lettres, 2021. English. ⟨NNT : 2021UPSLM070⟩. ⟨tel-03771834⟩



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