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An advanced EMMS scheme for the prediction of drag coefficient under a 1.2 MWth CFBC isothermal flow-Part I: Numerical formulation

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dc.contributor.author Nikolopoulos, A en
dc.contributor.author Papafotiou, D en
dc.contributor.author Nikolopoulos, N en
dc.contributor.author Grammelis, P en
dc.contributor.author Kakaras, E en
dc.date.accessioned 2014-03-01T01:32:37Z
dc.date.available 2014-03-01T01:32:37Z
dc.date.issued 2010 en
dc.identifier.issn 0009-2509 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/20199
dc.subject Clusters en
dc.subject EMMS en
dc.subject Fluidization en
dc.subject Hydrodynamics en
dc.subject Multiphase flow en
dc.subject Particle en
dc.subject.classification Engineering, Chemical en
dc.subject.other Algebraic modeling en
dc.subject.other CFD analysis en
dc.subject.other Circulating fluidized bed en
dc.subject.other Clusters en
dc.subject.other Co-existing en
dc.subject.other Conventional models en
dc.subject.other EMMS en
dc.subject.other Energy equation en
dc.subject.other Energy minimization en
dc.subject.other Gas solid two phase flow en
dc.subject.other Heterogeneous flow en
dc.subject.other Inert materials en
dc.subject.other Isothermal flows en
dc.subject.other Main characteristics en
dc.subject.other Momentum exchange en
dc.subject.other Multi-scale structures en
dc.subject.other Multiscales en
dc.subject.other Numerical formulation en
dc.subject.other Operating problems en
dc.subject.other Optimization software en
dc.subject.other Slip velocity en
dc.subject.other Agglomeration en
dc.subject.other Drag en
dc.subject.other Drag coefficient en
dc.subject.other Flow fields en
dc.subject.other Fluid dynamics en
dc.subject.other Fluidization en
dc.subject.other Fluidized bed process en
dc.subject.other Fluidized beds en
dc.subject.other Hydrodynamics en
dc.subject.other Industrial applications en
dc.subject.other Inert gases en
dc.subject.other Multiphase flow en
dc.subject.other Optimization en
dc.subject.other Computational fluid dynamics en
dc.title An advanced EMMS scheme for the prediction of drag coefficient under a 1.2 MWth CFBC isothermal flow-Part I: Numerical formulation en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.ces.2010.03.054 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.ces.2010.03.054 en
heal.language English en
heal.publicationDate 2010 en
heal.abstract Range and size increment of industrial applications regarding Circulating Fluidized Bed (CFB) technology raise numerous design and operating problems. Further insight into the governing and complex multiphase flow physics regarding CFB operation can be provided by CFD analysis. However, it has been proven during the recent years that multi-scale phenomena occurring in CFB reactors cannot be accurately reproduced by conventional accurately reproduced by conventional models. Such model sare unable to accurately predict the moemntum exchange between the co-existing phases (gas and inert material) when calculating the drag coefficient. The main reason is that gas-solid two-phase flow features spatiotemporal multi-scale structures, named clusters, as the heterogensous flow field is developing. Aiming to evaluate the particles tendnecy to aggregate in clusters and describe the effects of this complicated mechanism on the main characteristisc of the induced multiphase flow field, the advanced Energy Minimization Multi-Scale (EMMS) analysis is applied. The EMMS scheme comprises of a set of equalities, constraints and a minimization energy equation, solved for a number of volume fraction's and slip velocitiy's values, using the optimization software General Algebraic Modeling System (GAMS). (C) 2010 Elsevier Ltd. All rights reserved. en
heal.publisher PERGAMON-ELSEVIER SCIENCE LTD en
heal.journalName Chemical Engineering Science en
dc.identifier.doi 10.1016/j.ces.2010.03.054 en
dc.identifier.isi ISI:000278603400017 en
dc.identifier.volume 65 en
dc.identifier.issue 13 en
dc.identifier.spage 4080 en
dc.identifier.epage 4088 en


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