Analytical model to locate the fluidisation interface in a solid-gas vacuum fluidised bed

Kumar,A, Hodgson,P, Fabijanic,D, Gao,W and Das,S 2014, Analytical model to locate the fluidisation interface in a solid-gas vacuum fluidised bed, Powder technology, vol. 266, pp. 463-474, doi: 10.1016/j.powtec.2014.04.046.

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Title Analytical model to locate the fluidisation interface in a solid-gas vacuum fluidised bed
Author(s) Kumar,A
Hodgson,P
Fabijanic,DORCID iD for Fabijanic,D orcid.org/0000-0003-4857-0398
Gao,WORCID iD for Gao,W orcid.org/0000-0002-7390-169X
Das,S
Journal name Powder technology
Volume number 266
Start page 463
End page 474
Publisher Elsevier BV
Place of publication Amsterdam, Netherlands
Publication date 2014-11
ISSN 0032-5910
1873-328X
Keyword(s) Fluidisation interface
Segregation
Vacuum fluidisation
Science & Technology
Technology
Engineering, Chemical
Engineering
REDUCED PRESSURE
QUALITY
Summary Vacuum fluidised beds have a distinct advantage of being operated with reduced mass consumption of the fluidising media. However, a low quality of fluidisation reduces the opportunity to utilise the bubbling regime in vacuum fluidised beds. Fluidisation maps are often used to depict the interface between the quiescent, bubbling and slugging regimes inside a fluidised bed. Such maps have been obtained by visual observations of the fluidisation interface in transparent fluidised beds. For beds which are visually inaccessible fluidisation maps are difficult to obtain. The present work therefore attempts to model the interface travel in a vacuum fluidised bed. The pressure gradient due to the bed weight has been determined to be a main contributor for fluidisation/defluidisation under vacuum. A simple analytical model based on the pressure gradient (PG model) is developed to predict the interface location in a vacuum fluidised bed. For a segregated bed, the Gibilaro-Rowe (GR) model is modified and used to predict the jetsam layer growth along with the fluidisation interface. The predictions are compared with the experimental data for minimally and highly segregated particles and it is seen that for non-segregated powders the predictions are quite accurate. Lack of sufficient knowledge of bubble characteristics, however, impeded accurate prediction of the jetsam growth especially at high flow rates. However, an approximate complete fluidisation interface is successfully predicted using the GR-PG model. © 2014 Elsevier B.V.
Language eng
DOI 10.1016/j.powtec.2014.04.046
Field of Research 109999 Technology not elsewhere classified
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier BV
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070497

Document type: Journal Article
Collections: Institute for Frontier Materials
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