On montre que des résultats présentés récemment sur le comportement des lits fluidisés dans des conditions de fonctionnement extrêmes montrent un bon accord quantitatif avec les prédictions d’un critère de dynamique des fluides établi depuis longtemps pour l’apparition de l’instabilité du régime fluidisé homogène. Les quatre séries d’expériences portent sur la fluidisation dans des conditions de pression très élevées (par des fl uides supercritiques), à des forces de champs gravitationnels effectives très élevées et très faibles et à de très faibles concentrations de particules.
Recently reported results for the behaviour of fluidized beds under extreme conditions of operation are shown to be in good quantitative agreement with the predictions of a long established fluid-dynamic criterion for the onset of instability of the homogeneously fluidized state. The four sets of experiments relate to fluidization under very high pressure conditions (by supercritical fluids), at very high and very low effective gravitational field strengths, and at very low particle concentrations.
Stability of homogeneous fluidisation under extreme conditions of operation
FOSCOLO, Pier Ugo;
2004-01-01
Abstract
Recently reported results for the behaviour of fluidized beds under extreme conditions of operation are shown to be in good quantitative agreement with the predictions of a long established fluid-dynamic criterion for the onset of instability of the homogeneously fluidized state. The four sets of experiments relate to fluidization under very high pressure conditions (by supercritical fluids), at very high and very low effective gravitational field strengths, and at very low particle concentrations.Pubblicazioni consigliate
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