Drag models comparison by single injection in vacuum fluidised beds

Kumari, Apurv, Hodgson, Peter, Gao, Weimin, Fabijanic, Daniel and Das, Subrat 2013, Drag models comparison by single injection in vacuum fluidised beds, in ICMF 2013 : Proceedings of the International Conference on Multiphase Flow, ICMF, Jeju, Korea, pp. 1-6.

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Title Drag models comparison by single injection in vacuum fluidised beds
Author(s) Kumari, Apurv
Hodgson, Peter
Gao, WeiminORCID iD for Gao, Weimin orcid.org/0000-0002-7390-169X
Fabijanic, DanielORCID iD for Fabijanic, Daniel orcid.org/0000-0003-4857-0398
Das, Subrat
Conference name International Conference on Multiphase Flow (2012: Jeju, Korea)
Conference location Jeju, Korea
Conference dates 26-31 May. 2013
Title of proceedings ICMF 2013 : Proceedings of the International Conference on Multiphase Flow
Editor(s) [Unknown]
Publication date 2013
Conference series International Conference on Multiphase Flow
Start page 1
End page 6
Total pages 6
Publisher ICMF
Place of publication Jeju, Korea
Keyword(s) vacuum fluidisation
drag models
single bubble injection
CFD
Summary Single bubble injection simulations inside a minimally fluidized bed have been studied widely and are often used to validate the accuracy of different numerical models. Bubble shape, size and voidage distribution are the important parameters that are validated from the experiments. In the present work, the most widely used drag model (Gidaspow’s drag model) is compared to a new proposed slip flow drag model which takes into account the presence of the slip flow regime, often encountered in vacuum fluidized beds and characterised by Knudsen no. (Kn). Shape and size prediction of the bubble evolution inside the bed is carried out numerically by using the two fluid model, comparing the results predicted by the drag models. It is seen that the predictions are different for the two drag models only under high vacuum conditions corresponding to Kn in slip/transition flow regime. The predictions are also found sensitive to pressure gradient in the bed and fluid velocity.
Language eng
Field of Research 091504 Fluidisation and Fluid Mechanics
091501 Computational Fluid Dynamics
091307 Numerical Modelling and Mechanical Characterisation
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category E1 Full written paper - refereed
Persistent URL http://hdl.handle.net/10536/DRO/DU:30053588

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