Qualitative assessment of bubble behaviour for central and asymmetric injection in 2D gas-solid fluidized bed using image analysis technique and CFD modelling

Kumar, Vishwanath, Das, Subrat, Kumar, Apurv, Fabijanic, Daniel and Hodgson, Peter 2015, Qualitative assessment of bubble behaviour for central and asymmetric injection in 2D gas-solid fluidized bed using image analysis technique and CFD modelling, in CFD 2015 : 11th International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne Vic., pp. 1-6.

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Title Qualitative assessment of bubble behaviour for central and asymmetric injection in 2D gas-solid fluidized bed using image analysis technique and CFD modelling
Author(s) Kumar, Vishwanath
Das, Subrat
Kumar, Apurv
Fabijanic, Daniel
Hodgson, Peter
Conference name Computational Fluid Dynamics in the Minerals and Process Industries. Conference (11th : 2015 Melbourne, Vic.)
Conference location Melbourne, Vic.
Conference dates 7-9 Dec. 2015
Title of proceedings CFD 2015 : 11th International Conference on CFD in the Minerals and Process Industries
Editor(s) Solnordal, C. B.
Liovic, P.
Delaney, G. W.
Cummins, S. J.
Schwarz, M. P.
Witt, P. J.
Publication date 2015
Start page 1
End page 6
Total pages 6
Publisher CSIRO
Place of publication Melbourne Vic.
Keyword(s) gas-solid fluidisation
wall effect
image analysis
bubble shape
trajectory
CFD
Summary Bubble 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 thebubble 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.
ISBN 9781486306206
Language eng
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category E1 Full written paper - refereed
ERA Research output type E Conference publication
Copyright notice ©2015, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30082890

Document type: Conference Paper
Collections: School of Engineering
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