MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 6. Topics of Gas-Liquid-Solid Fluidized Bed Hydrodynamics

Hristov, Jordan

doi:10.1515/revce.2007.23.6.373

Cited by 19 publications

(10 citation statements)

References 47 publications

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“…The interested reader may find additional details on the historical aspects and current state of the art of MFBs in extended reviews reported elsewhere [56,58,59,61,60]. Histrov has more recently published a series of papers devoted to provide an unifying approach to the application of magnetic fields for assisting fluidization of Geldart B granular materials [57,[92][93][94][95][96][97][98][99].…”

Section: Brief Review On Magnetofluidizationmentioning

confidence: 99%

Effect of particle size polydispersity on the yield stress of magnetofluidized beds as depending on the magnetic field orientation

Espin

Quintanilla

Valverde

2015

Chemical Engineering Journal

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Section: Brief Review On Magnetofluidizationmentioning

confidence: 99%

Effect of particle size polydispersity on the yield stress of magnetofluidized beds as depending on the magnetic field orientation

Espin

Quintanilla

Valverde

2015

Chemical Engineering Journal

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“…Bioreactors (L-S or G-L-S) with cells or enzymes immobilized on magnetic supports since both the variable vessel crosssection and the induced magnetic cohesion might be a suitable combination avoiding many problems in such devices (Hristov and Ivanova, 1999;Hristov, 2006). These are only ideas based on the current status of the magnetic field assisted fluidization (Hristov, 2002(Hristov, , 2003a(Hristov, ,b, 2004(Hristov, , 2006(Hristov, , 2007b and might be expected that articles with new results will appear soon.…”

Section: Reasonable Applications Of Mfatbs-some Suggestionsmentioning

confidence: 99%

“…In all of them the interparticle forces are mainly generated by capillary forces and cannot be controlled remotely. The present article addresses spouted bed behaviour in the case of gas-fluidized magnetic particles and interparticle forces induced by an external magnetic field that creates a new branch in the magnetically assisted fluidization (Hristov, 2002(Hristov, , 2003a(Hristov, ,b, 2004(Hristov, , 2006(Hristov, , 2007b.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetically assisted fluidization deals with magnetic solids fluidized by liquid (Hristov, 2006), gas (Hristov, 2002(Hristov, , 2003a, or gas-liquid flow (Hristov, 2007b) with two basic magnetization modes: Magnetization FIRST (magnetization of a fixed bed undergoing fluidization) and Magnetization LAST (magnetization of preliminarily fluidized beds). With Magnetization FIRST mode the induced interparticle forces yield particle aggregation (i.e., magnetic flocculation) that alters the bed behaviour and creates a Meta-regime commonly known as a magnetically stabilized bed (MSB).…”

Section: Introductionmentioning

confidence: 99%

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Magnetically assisted gas–solid fluidization in a tapered vessel: First report with observations and dimensional analysis

Hristov

2008

Can J Chem Eng

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The article presents first experimental results on gas-solid fluidization in a tapered bed in presence of an external transverse magnetic field that creates a novel branch in magnetically assisted fluidization. Phase diagrams similar to those used to describe cylindrical beds have been created to distinguish the bed regimes occurring under the action of two principle macroscopic variables such as field intensity and gas flow rate. A detailed analysis and parallelism to the bed behaviour exhibited by non-magnetic spouted beds of cohesive particles have been performed. Principle process variables such as bed depth, field intensity, particle size, cone angle have been detected. A dimensional analysis utilizing a "pressure transform" of the initial set of variables has been applied to develop scaling relationships. Examples of scaling experimental data pertinent to the minimum spouting point and involving the magnetic granular Bond number have been developed. L'article présente les premiers résultats expérimentaux sur la fluidisation gaz-solide dans un lit conique en présence d'un champ magnétique transverse externe qui crée une nouvelle branche dans la fluidisation assistée magnétiquement. Des diagrammes de phases semblablesà ceux utilisés pour décrire les lits cylindriques ontétéétablis pour distinguer les régimes de lit survenant sous l'action des deux variables macroscopiques principales que sont l'intensité de champ et le débit de gaz. Une analyse détaillée et un parallèle avec le comportement de lit affiché par les lits jaillissants non magnétiques ontété effectués. Les variables de procédés principales, telles que la profondeur de lit, l'intensité de champ, la taille des particules et l'angle de cône, ontété détectées. Une analyse dimensionnelle utilisant une transformée de pression du jeu initial de variables, aété appliquée pourétablir les relations de miseà l'échelle. Des exemples de données expérimentales de miseà l'échelle pertinentes pour le point de jaillissement minimum et faisant intervenir le nombre de Bond granulaire magnétique, ontétéélaborés.

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“…The diesel yield obtained using the MSB reactor was higher than that obtained with the fixed-bed reactor over the entire temperature range from 423 to 503 K. This can be attributed to the MSB having more efficient interphase mass transfer properties, lower pressure drop, and the absence of particle clogging, which inhibits formation of hotspots during the exothermic reaction system allowing a lower optimal reaction temperature. 25,27 Figure 6b shows the effect of varying the system pressure on the oligomerization performance of the magnetic catalyst under the reaction conditions of temperature of 463 K and LHSV of 1.0 h 21 in the fixed-bed reactor and temperature of 443 K, LHSV of 4.0 h 21 and magnetic field intensity of 30 kA m 21 in the MSB reactor. The diesel yield showed a gradual increase with system pressure in both reactors.…”

mentioning

confidence: 99%

Light FCC gasoline olefin oligomerization over a magnetic NiSo₄/γ‐Al₂o₃ catalyst in a magnetically stabilized bed

Peng¹,

Dong²,

Meng³

et al. 2009

AIChE Journal

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catalysts were prepared by impregnating NiSO 4 solutions onto the c-Al 2 O 3 support containing a magnetic material of Fe 3 O 4 . Characterization by XRD, NH 3 -TPD, and thermal analysis showed that the magnetic NiSO 4 /c-Al 2 O 3 catalyst with a nickel content of 7.0% by weight had a monolayer dispersion of NiSO 4 and the largest number of moderate strength acid sites, and a high specific saturation magnetization. The magnetic catalyst was evaluated for light FCC gasoline olefin oligomerization in both fixed-bed and magnetically stabilized bed (MSB) reactors. Comparing with that in the fixed-bed reactor, the optimal reaction temperature in the MSB lowered to 443 K, and its space velocity ranged broadly from 2.0 to 6.0 h 21 . The sulfur-free diesel distillate produced by operation of the MSB for 100 h had higher cetane number and good low-temperature flow property, which illuminates a promising application of the MSB to manufacture clean diesel fuels with high productivity and flexibility.

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MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 6. Topics of Gas-Liquid-Solid Fluidized Bed Hydrodynamics

Cited by 19 publications

References 47 publications

Effect of particle size polydispersity on the yield stress of magnetofluidized beds as depending on the magnetic field orientation

Effect of particle size polydispersity on the yield stress of magnetofluidized beds as depending on the magnetic field orientation

Magnetically assisted gas–solid fluidization in a tapered vessel: First report with observations and dimensional analysis

Light FCC gasoline olefin oligomerization over a magnetic NiSo₄/γ‐Al₂o₃ catalyst in a magnetically stabilized bed

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MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 6. Topics of Gas-Liquid-Solid Fluidized Bed Hydrodynamics

Cited by 19 publications

References 47 publications

Effect of particle size polydispersity on the yield stress of magnetofluidized beds as depending on the magnetic field orientation

Effect of particle size polydispersity on the yield stress of magnetofluidized beds as depending on the magnetic field orientation

Magnetically assisted gas–solid fluidization in a tapered vessel: First report with observations and dimensional analysis

Light FCC gasoline olefin oligomerization over a magnetic NiSo4/γ‐Al2o3 catalyst in a magnetically stabilized bed

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Light FCC gasoline olefin oligomerization over a magnetic NiSo₄/γ‐Al₂o₃ catalyst in a magnetically stabilized bed