Experimental Investigation of Hydrodynamics and Mass Transfer in Dense Fluidized Beds
The hydrodynamic behaviour of bubbling fluidized beds operated at ambient temperature and at 450 °C is investigated. Geldart B granular solids are fluidized at different gas superficial velocities using a high-pressure drop gas distributor. Customized uncooled capacitance probes are used for the exp...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIDIC Servizi S.r.l.
2025-07-01
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| Series: | Chemical Engineering Transactions |
| Online Access: | https://www.cetjournal.it/index.php/cet/article/view/15380 |
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| Summary: | The hydrodynamic behaviour of bubbling fluidized beds operated at ambient temperature and at 450 °C is investigated. Geldart B granular solids are fluidized at different gas superficial velocities using a high-pressure drop gas distributor. Customized uncooled capacitance probes are used for the experimental investigation. A statistical analysis of the time series of the local bed voidage is performed, allowing to generate Probability Density Functions (PDF). Emulsion phase features, as voidage and velocity have been estimated, together with visible bubble flow and bubble phase velocity. PDF display multimodal patterns in the part referring to the emulsion phase at increasing gas superficial velocity, highlighting the co-existence of sub-phases characterized by different voidage values. The influence of the bed hydrodynamics and expansion patterns of the emulsion phase on the gas mass transfer around active particles is also investigated. Reactive experiments of catalytic carbon monoxide oxidation are carried out to calculate the particle Sherwood number. Experimental results confirm that a close relationship exists between expansion patterns of the emulsion phase and mass transfer. |
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| ISSN: | 2283-9216 |