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Magnetic stabilization of fluidized beds: Effect of magnetic field orientation

 

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dc.creator Espín Milla, Manuel Jesús es
dc.creator Sánchez Quintanilla, Miguel Angel es
dc.creator Valverde Millán, José Manuel es
dc.date.accessioned 2018-01-31T17:58:39Z
dc.date.available 2018-01-31T17:58:39Z
dc.date.issued 2017
dc.identifier.citation Espín Milla, M.J., Sánchez Quintanilla, M.A. y Valverde Millán, J.M. (2017). Magnetic stabilization of fluidized beds: Effect of magnetic field orientation. Chemical Engineering Journal, 313, 1335-1345.
dc.identifier.issn 1385-8947 es
dc.identifier.uri https://hdl.handle.net/11441/69841
dc.description.abstract Fluidized beds of granular materials can be stabilized by interparticle attractive forces which confer the expanded bed an elastic modulus that stabilizes it against flow perturbations. Stabilization in a structure of enduring contacts is seen to occur naturally due to the universal van der Waals forces for ∼50 μm particle size beds albeit in a quite reduced interval of gas velocities over the minimum fluidization velocity vmf. As shown in this work, a magnetic field may induce attractive forces between magnetizable particles thus extending the stable fluidization interval well beyond vmf. The structure of the magnetically stabilized bed is however markedly anisotropic since attractive magnetic forces are maximum along the direction of the externally imposed field which leads to the formation of chain particle aggregates. This paper shows experimental measurements on the magnetic yield stress, gas velocity at the transition to marginal stability and microstructure of magnetostabilized beds as affected by the direction of the magnetic field. Data shows that magnetic stabilization is optimized for co-flow fields as chain aggregates are preferentially orientated parallel to the magnetic field and along the direction of minimum drag. As the magnetic field is tilted, particle chains become tilted according to a balance between the magnetic attractive force between the particles and the vertical drag force, which reduces the magnetic yield stress and therefore shortens the interval of magnetic stabilization. es
dc.description.sponsorship Junta de Andalucía FQM-5735 es
dc.description.sponsorship Ministerio de Economia y Competitividad CTQ2014-52763-C2-2-R, FIS2014-54539-P es
dc.format application/pdf es
dc.language.iso eng es
dc.publisher Elsevier es
dc.relation.ispartof Chemical Engineering Journal, 313, 1335-1345.
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 Internacional *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.subject Fluidization es
dc.subject Interparticle forces es
dc.subject Magnetic stabilization es
dc.subject Magnetofluidization es
dc.subject Magnetorheological fluids es
dc.subject Rheology es
dc.title Magnetic stabilization of fluidized beds: Effect of magnetic field orientation es
dc.type info:eu-repo/semantics/article es
dc.type.version info:eu-repo/semantics/submittedVersion es
dc.rights.accessrights info:eu-repo/semantics/openAccess es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Física Aplicada II es
dc.relation.projectID FQM-5735 es
dc.relation.projectID CTQ2014-52763-C2-2-R es
dc.relation.projectID FIS2014-54539-P es
dc.relation.publisherversion http://dx.doi.org/10.1016/j.cej.2016.11.023 es
dc.identifier.doi 10.1016/j.cej.2016.11.023 es
idus.format.extent 45 p. es
dc.journaltitle Chemical Engineering Journal es
dc.publication.volumen 313 es
dc.publication.initialPage 1335 es
dc.publication.endPage 1345 es
dc.contributor.funder Junta de Andalucía
dc.contributor.funder Ministerio de Economía y Competitividad (MINECO). España
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