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Etude de l'agrégation de particules solides en milieu non mouillant. Interprétation et modélisation

Abstract : The understanding of solid particles aggregation mechanisms in a non wetting medium is of great importance in many scientific fields. To study it, a model system is used ; it is composed of hydrophobic silica particles in a
water – ethanol mixture. Since the aggregates are fragile, aggregation had to be studied in-situ. This was possible thanks to a "laboratory-made" turbidimetric sensor. To know the aggregates' final size and morphology , other methods have also been used and their respective interest or validity determined. The influence of various parameters on aggregation have been studied, such as stirring speed, wettability, presence or not of gas, bubble injection...
The modelling of aggregation - fragmentation phenomena takes place in the framework of a population balance (validated by experimental particle sizing) and accounts for the hydrodynamics of the suspension as well as the physicochemical aspects of the non wetting medium. One of the most important points which comes out from this study is a reduction of fragmentation due to the presence of gas bridges between the solid particles in a non wetting liquid.
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Submitted on : Wednesday, April 12, 2006 - 5:29:25 PM
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  • HAL Id : tel-00012127, version 1


Patrick Cugniet. Etude de l'agrégation de particules solides en milieu non mouillant. Interprétation et modélisation. Génie des procédés. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2003. Français. ⟨tel-00012127⟩



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