Experimental observations on the different mechanisms for solid ejection in gas-fluidized beds

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dc.contributor.author Almendros-Ibáñez, José Antonio
dc.contributor.author Sánchez-Delgado, Sergio
dc.contributor.author Sobrino, Celia
dc.contributor.author Santana Santana, Domingo José
dc.date.accessioned 2012-02-28T16:56:39Z
dc.date.available 2012-02-28T16:56:39Z
dc.date.issued 2009-03
dc.identifier.bibliographicCitation Chemical Engineering and Processing: Process Intensification, 2009, vol. 48, nº 3 p. 734-744
dc.identifier.issn 0255-2701
dc.identifier.uri http://hdl.handle.net/10016/13512
dc.description.abstract This work presents an experimental study of the ejection velocity for different mechanisms of solid ejection in fluidized beds. The experiments were carried out in a 2D fluidized bed, where the bubble eruptions were recorded with a frequency of 250 frames per second using a high speed video camera with a resolution of 1.3 Megapixels. The results show that in isolated bubble eruption, the dome velocity is significantly reduced by the effect of a group of raining particles in the form of stalactites within the bubble. Higher velocities are observed when bubble coalescence takes place. If bubbles coalesce before the leading bubble breaks, the momentumof the trailing bubble together with the increase in the throughflowaccelerate the dome of the leading bubble. In contrast, when coalescence occurs after the breakage of the leading bubble, the wake of the trailing bubble is projected into the freeboard with a very high velocity (wake spike mechanism). The last observed mechanism, the jet spike mechanism, occurs when a stream of bubbles reaches the bed surface following the path opened by the previous bubbles. A cloud of particles moving upward is observed, although their velocities are not as high as in thewake spike mechanism due to the interchange of momentum during the collisions with other particles. Finally, an explanation for some of the patterns of gas release from erupting bubbles recently observed by Hartung et al. [G. Hartung, C.R. Müller, J. Hult, J.S. Dennis, C.F. Kaminski, Laser diagnostic investigation of the bubble eruption patterns in the freeboard of fluidized beds. 1. Optimization of acetone planer laser induced fluorescence measurements. Ind. Eng. Chem. Res. 47 (2008) 5686–5697] is proposed
dc.description.sponsorship This work has been supported by the National Energy Programme of the Spanish Ministry of Education under the project number ENE2006-01401
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights ©Elsevier
dc.subject.other Fluidized bed
dc.subject.other Fluidized beds
dc.subject.other Solid ejection
dc.subject.other Bubble eruption
dc.title Experimental observations on the different mechanisms for solid ejection in gas-fluidized beds
dc.type article
dc.description.status Publicado
dc.relation.publisherversion http://dx.doi.org/10.1016/j.cep.2008.09.008
dc.subject.eciencia Ingeniería Industrial
dc.subject.eciencia Física
dc.identifier.doi 10.1016/j.cep.2008.09.008
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 734
dc.identifier.publicationissue 3
dc.identifier.publicationlastpage 744
dc.identifier.publicationtitle Chemical Engineering and Processing: Process Intensification
dc.identifier.publicationvolume 48
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