Étude expérimentale et simulation de la ségrégation mécanique et thermique de billes millimétriques dans un séchoir de type tambour tournant

Abstract : Product homogeneity issue during mechanical and thermal processing of a bi-dispersed bed with two particles’ sizes or two particles’ densities in a horizontal rotary drum was considered. In the first part, the mixing of milli-metric size spherical beads in a two-dimensional drum was simulated by means of a commercial discrete element software and optically observed in a specially designed laboratory scale device. The spatial distribution of the particles in the front bed section, the radial mechanical segregation index and the dynamic slope angle were analyzed. After adjusting the friction coefficient, the simulation results were close to the experimental ones. Important phenomena of radial and axial segregation have been highlighted. The radial segregation index was found to be significantly decreased by applying an important number of long baffles, while using few short baffles had practically no influence on segregation intensity. In the second part, the heating of the bed of spherical beads in a 2D drum with hot peripheral wall was simulated by means of the discrete element software. Mono-dispersed, gaussian-dispersed and bi-dispersed beds (same as in part 1) were considered. The mechanical segregation and the thermal segregation indexes were calculated for the different types of bed and for different baffles configurations. The thermal segregation was found to be generally enhanced by the mechanical segregation and reached its highest values for the bi-density bed. Increasing the number and the length of the baffles considerably improved the overall heating rate and the thermal homogeneity of the considered beds
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Aline Mesnier. Étude expérimentale et simulation de la ségrégation mécanique et thermique de billes millimétriques dans un séchoir de type tambour tournant. Génie des procédés. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSE1046⟩. ⟨tel-02180891⟩

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