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• W2000685854 abstract "The local solid flow structure of the bubbling fluidized bed of sand particles was investigated in order to identify and characterize the clusters. Extensive experiments were carried out using an optical fibre probe, measuring the velocity and the diameter of clusters. Under all operating conditions, ascending and descending clusters co-existed at all measurement locations. The locus of the inversion point at which the directions of cluster motion changed was determined. The velocity of the ascending clusters was a function of both superficial gas velocity and the radial and axial position. With increasing superficial gas velocity, both the velocity and the diameter of ascending clusters decreased near the wall. However, the velocity of descending clusters depended mainly on superficial gas velocity and the largest clusters existed closer to the wall. The results of this study help to explain cluster hydrodynamics in fluidized beds. On a étudié la structure locale de l'écoulement des solides dans un lit fluidisé bullant de particules de sable dans le but de déterminer et caractériser le phénomène d'agrégation. Des expériences approfondies ont été menées à l'aide d'une sonde à fibres optiques, qui mesure la vitesse et le diamètre des agrégats. Les résultats montrent dans toutes les conditions opératoires la coexistence d'agrégats qui montent et qui descendent aux endroits où ont été prises les mesures. L'emplacement du point d'inversion où se produisent les changements de direction des agrégats a été déterminé. La vitesse des agrégats ascendants est fonction à la fois de la vitesse de gaz superficielle et de la position tant radiale qu'axiale. Avec l'augmentation de la vitesse de gaz superficielle, la vitesse des agrégats ascendants diminue près des parois. La même tendance est observée pour le diamètre des agrégats ascendants. Toutefois, la vitesse des agrégats descendants dépend principalement de la vitesse de gaz superficielle et les plus gros agrégats se trouvent plutôt près des parois. Les résultats de cette étude contribuent à la compréhension des agrégats dans les lits fluidisés." @default.
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• W2000685854 date "2009-06-01" @default.
• W2000685854 modified "2023-10-17" @default.
• W2000685854 title "Clusters identification and characterization in a gas-solid fluidized bed by the wavelet analysis" @default.
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• W2000685854 doi "https://doi.org/10.1002/cjce.20167" @default.
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