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Qualitative assessment of bubble behaviour for central and asymmetric injection in 2D gas-solid fluidized bed using image analysis technique and CFD modelling
conference contribution
posted on 2015-01-01, 00:00 authored by Vishwanath Kumar Panangipalli, Subrat DasSubrat Das, Apurv Kumar, Daniel FabijanicDaniel Fabijanic, Peter HodgsonPeter HodgsonBubble characteristics such as shape, size, and trajectory control the hydrodynamics and therefore heat transfer in fluidized bed reactors. Thus understanding these characteristics is very important for the design and scaleup of fluidized beds. An earlier developed Eulerian-Eulerian two-fluid model for simulating dense gas–solid two-phase flow has been used to compare the experimental data in a pseudo-two-dimensional (2-D) bed. Bubbles are injected asymmetrically by locating the nozzle at proximity to the wall, thus presenting the effect wall has on asymmetrical injection as compared to symmetrical injection. In this work, a digital image analysis technique was developed to study the bubble behaviour in a two-dimensional bubbling bed. The high-speed photography reveals an asymmetric wake formation during detachment indicating an early onset of mixing process. The wall forces acts tangentially on the
bubble and has a significant impact on the bubble shape, neck formation during detachment and its trajectory through the bed. Larger bubbles drifting away from the centre with longer paths are observed. This qualitative behaviour is well predicted by CFD modelling. Asymmetric injection can significantly influence the heat and mass transfer characteristics.
bubble and has a significant impact on the bubble shape, neck formation during detachment and its trajectory through the bed. Larger bubbles drifting away from the centre with longer paths are observed. This qualitative behaviour is well predicted by CFD modelling. Asymmetric injection can significantly influence the heat and mass transfer characteristics.
History
Event
Computational Fluid Dynamics in the Minerals and Process Industries. Conference (11th : 2015 Melbourne, Vic.)Pagination
1 - 6Publisher
CSIROLocation
Melbourne, Vic.Place of publication
Melbourne Vic.Start date
2015-12-07End date
2015-12-09ISBN-13
9781486306206Language
engPublication classification
E Conference publication; E1 Full written paper - refereedCopyright notice
2015, CSIROEditor/Contributor(s)
C Solnordal, P Liovic, G Delaney, S Cummins, M Schwarz, P WittTitle of proceedings
CFD 2015 : 11th International Conference on CFD in the Minerals and Process IndustriesUsage metrics
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