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Drag models comparison by single injection in vacuum fluidised beds
conference contribution
posted on 2013-01-01, 00:00 authored by A Kumari, Peter HodgsonPeter Hodgson, Weimin Gao, Daniel FabijanicDaniel Fabijanic, Subrat DasSubrat DasSingle 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.
History
Event
International Conference on Multiphase Flow (2012: Jeju, Korea)Pagination
1 - 6Publisher
ICMFLocation
Jeju, KoreaPlace of publication
Jeju, KoreaStart date
2013-05-26End date
2013-05-31Language
engPublication classification
E1 Full written paper - refereedTitle of proceedings
ICMF 2013 : Proceedings of the International Conference on Multiphase FlowUsage metrics
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