Étude de l'efficacité de dispersion des mélangeurs statiques Sulzer Smx

Abstract : The present work aims at fulfilling the lack of information about a static mixer's ability to effectively disperse fluids of various viscosities in laminar flow regime. The effect of various operating conditions (such as viscosity ratios, volume fraction, number of mixer and rheology of the continuous phase) on the resulting dispersion are reported. The resulting drop diameter is used as a basis of comparison between the different sets of conditions. The measurement is done directly at the outlet of the mixers with an optical apparatus. It is also shown that using non-Newtonian fluid as a continuous phase can be treated as if it was Newtonian through the use of a process viscosity. With this viscosity, it is feasible to get precious information about fluid rheology, directly online. The last aspect of the experiment work consists in a feasibility study of dispersing pigments in a static mixer without the help of any chemical. The major result shows an inverse relation between the number of mixer elements and the volume fraction of the pigment. A second aspect of this study is to use information gathered from 3D finite element simulations to backup and understand the experimental results. If, for the moment, a direct simulation of two dispersed phases is unthinkable, it is perfectly possible to obtain useful information through one phase simulation results. A residence Time Distribution study clearly shows that the actual, most widely used, algorithm of particle tracking is unable to provide results. The intricate geometry of the mixer and the mesh used are both responsible or the poor results. It is also found that some fluid elements used in 3D simulations are inappropriate for this kind of study because they provide erroneous results. Various continuous phase rheology can also be tested and show almost no effect on the performance of the mixer as the experimental results.
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Louis Fradette. Étude de l'efficacité de dispersion des mélangeurs statiques Sulzer Smx. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL090N⟩. ⟨tel-01749910⟩

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