Modeling the Injection of Gas‐Liquid Jets into Fluidized Beds of Fine Particles

Abstract

montrent un bon accord avec les données expérimen-tales. Le présent modèle peut servir à caractériser le comportement de jets gaz-liquide (vaporisations fines) injectés dans des lits fluidisés de particules fines.

Study of gas–liquid jet boundaries in a gas–solid fluidized bed

“…A weaker triboelectric signal was expected to be observed in this region, since the solids have not yet been fully accelerated by the jet. However, the observed length of the low-signal region ranged between 30 and 50 nozzle diameters, compared to the calculated length of up to 2.1 nozzle diameters for the potential core by Ariyapadi et al [1]. Clearly, the observed region of weak signal does not represent just the potential core region as it is much too long.…”

“…8. The initial low signal region was initially attributed to the existence of the potential core region described by De Michele et al [21] and Ariyapadi et al [1]. A weaker triboelectric signal was expected to be observed in this region, since the solids have not yet been fully accelerated by the jet.…”

“…Recently, however, the interactions between horizontal gas-liquid jets and fluidized beds have been studied more extensively. Ariyapadi et al [1] created a model of gas-liquid injections into fluidized beds, which used existing gas-only models as its basis. This model has been proven to adequately predict the entrainment rates and solids flow patterns in a gas-liquid jet.…”

Modelling of penetration of horizontal supersonic nozzles in high temperature fluidised beds

“…[45][46][47] Li et al [6] found that the empirical correlations listed in Table 1 are unable to accurately predict the penetration of supersonic jets in high temperature fluidised beds. The Froude number has been used in the empirical correlations of Merry, [37] Benjelloun [39] and Ariyapadi et al [48] Li et al [6] proposed a new empirical correlation based on experimental data collected from supersonic nozzles discharging into hot fluidised beds: Figures 17 and 18 show that correlations from both Merry and Yates overestimated the jet penetration length.…”

Fluidized‐Bed Reactors1A list of abbreviations/acronyms used in the text is provided at the end of the chapter.

“…Investigations with nonvaporizing horizontal gas-liquid spray jets have shown that, with a proper design of the injection nozzle, it is possible to penetrate over several decimeters into the bed before the jet breaks up [91,92]. Investigations with nonvaporizing horizontal gas-liquid spray jets have shown that, with a proper design of the injection nozzle, it is possible to penetrate over several decimeters into the bed before the jet breaks up [91,92].…”