Comportement d’une particule dans un tube à essai agité par un vortex

Abstract : Vortex-shakers prove to be efficient devices for studying the dustiness of powders. The position of an alumina particle in an agitated test tube has been followed by PEPT (Positron Emission Particle Tracking). Population densities were computed as the frequency of the particle’s presence in different regions of the test tube. The velocities of the particle were calculated by filtering out all displacements inferior to a critical distance dcrit so as not to consider spurious movements caused by experimental noise. After its validation, the methodology was applied to the standard condition of a vortex shaker experiment (ω = 1500 rpm, 2 g of powder and open test tube). While the horizontal coordinates and velocity components follow a symmetric distribution, the vertical coordinate is characterised by a large asymmetrical plateau. The heights reached by the particle (up to 24.3 mm) are small in comparison to that of the test tube (150 mm). The greatest velocities are found near the inner wall of the test tube and at the highest heights where the population densities are the lowest. The method explicated in the present study is directly applicable to any other sets of data obtained through PEPT, especially if the system is of small dimension.
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Marc Fischer, Somik Chakravarty, Olivier Le Bihan, Martin Morgeneyer. Comportement d’une particule dans un tube à essai agité par un vortex. 31. Congrès Français sur les Aérosols (CFA 2018), Jan 2018, Paris, France. ⟨ineris-01863326⟩

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