Investigation of a swirling flow nozzle for a fluidised bed gas distributor
Chemical Engineering Science
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Aworinde, S., Holland, D., & Davidson, J. (2015). Investigation of a swirling flow nozzle for a fluidised bed gas distributor. Chemical Engineering Science, 132 22-31. https://doi.org/10.1016/j.ces.2015.04.001
This paper relates to a multi-orifice distributor for a gas-fluidised bed, using many upward-facing nozzles, equally spaced in a horizontal plate. Each orifice contained a removable helical coil, which made the gas swirl as it entered the bed. For a single orifice in such a distributor, ultra-fast magnetic resonance imaging (MRI) and pressure measurements were applied to study: (i) the formation of jets and bubbles and (ii) the orifice pressure drop. Results from MRI show that the swirling flow induced by the helix significantly improves the fluidisation quality compared to a plain nozzle without spiral. The helix gives rise to secondary flow which increases pressure drop across the nozzle, the measured values of which are predicted satisfactorily by using a friction factor correlation for helical coils.
The authors thank Dr Stephen Sutcliffe and Mo Dadvar of Huntsman for providing both financial and technical assistance for this project, and Suttons Seeds for the kind donation of poppy seeds used for MRI. S.M. Aworinde is grateful to the Cambridge Commonwealth Trust (CCT) for scholarship award to study at Cambridge.
External DOI: https://doi.org/10.1016/j.ces.2015.04.001
This record's URL: https://www.repository.cam.ac.uk/handle/1810/261467
Attribution-NonCommercial-NoDerivatives 4.0 International, Attribution-NonCommercial-NoDerivatives 4.0 International, Attribution-NonCommercial-NoDerivatives 4.0 International
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