Hydrodynamic characteristics of a magnetically stabilized air fluidized bed of an admixture of magnetic and non-magnetic particles

Wu, Wei; Navada, A.; Saxena, S.C.

doi:10.1016/s0032-5910(96)03196-8

Cited by 40 publications

(16 citation statements)

References 4 publications

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“…The above correlation could reproduce the experimental data within a maximum scatter off 10%. A similar success was achieved for the data of Wu et al (1997aWu et al ( , 1997b for admixtures of iron (1416 p) and copper (934 p) particles as long as H was smaller than about 7000 Nm.…”

Section: Resultssupporting

confidence: 69%

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Hydrodynamic characteristics of magnetically stabilized fluidized admixture beds of iron and copper particles

Saxena

1999

Can J Chem Eng

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Hydrodynamic characteristics of fluidized beds of pure iron (1416 pn), copper (934 pn) and their admixture (25,50 and 75 mass %) particles when exposed to a uniform magnetic field collinear with the gas flow are investigated. Bed pressure-drop data taken as a function of increasing and decreasing gas velocities (up to about 8 d s ) for different values of magnetic-field intensity over a wide range (0 to 17 272 N m ) are employed to determine the superficial minimum bubbling and fluidization gas velocities at ambient temperature and pressure. The minimum bubbling velocity is found to increase with an increase in the value of the magnetic-field intensity, as well as with the mass fraction of magnetizable particles in the bed, These data are correlated with an empirical relation, as well as with a semi-theoretical expression. The bed voidage data are also generated and analyzed, as also the bed quality fluidization in terms of interparticle magnetic forces. These hydrodynamic properties of magnetically stabilized fluidized-bed reactors are useful in their design and operation for a variety of chemical and biochemical applications.On a etudie les caracteristiques hydrodynamiques de lits fluidises de particules de fer pur (1416 p) et de c u k e pur (934 pm), puis de leur melange (25,50 et 75% en masse) lorsqu'elles sont exposees a un champ magnetique uniforme colineaire avec le debit de gaz. On a employe des donnees de perte de charge de lit en fonction des vitesses de gaz croissant et decroissante (jusqu'a environ 8 m) pour une large gamme d'intensite de champ magnetique (0 a 17272 N m ) afin de determiner le bullage superficiel minimum et les vitesses de gaz de fluidisation a la temperature et a la pression ambiante. On a trouve que la vitesse de bullage minimum augmentait avec la valeur de I'intensite du champ magnetique ainsi qu'avec la fraction de masse des particules magnetisables dans le lit. Ces donnees sont correlees a une relation empirique et a une expression semi-theorique. Les donnees de vide de lit sont egalement calculees et analysees tout comme la fluidisation de qualite de lit en termes des forces magnetiquement stabilises sont utiles dans leur conception et leur fonctionnement pour diverses applications chimiques et biochimiques.Keywords: magnetically stabilized fluidized beds, minimum bubbling velocity. Figure 1 -Schematic of the UIC magnetofluidized-bed column facility. uppression and delay of bubbling phenomena in a flu-S idized bed of ferromagnetic particles under the influence of an uniform external magnetic field parallel to the gas velocity vector have been well investigated, as is evident from the reviews of Liu et al. (1991), Saxena et al. (1994, and several others. The work on mixtures of magnetic and nonmagnetic particles is relatively scarce. Lucas et al. 'Author to whom correspondence should be addressed. E-mail address: saxena@uic.edu (1984) and Arnaldos et al. (1985) investigated beds of mixed particles of sintered nickel-silica, steel-copper, and steel-silica up to magnetic-field int...

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Section: Resultssupporting

confidence: 69%

“…is described by Wu, Navada and Saxena (1997a), and the detailed measurements of Wu, Smith and Saxena (1997b) revealed that the variations of field intensity in the central cylindrical region of radius and height equal to 7 cm are always less than 5%.…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic characteristics of magnetically stabilized fluidized admixture beds of iron and copper particles

Saxena

1999

Can J Chem Eng

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“…Also, to tackle what was found at high temperatures, the methodology can be chosen to imitate the cohesive behavior found at extreme operating temperatures in a friendlier environment. Techniques that have been applied include the following: increasing the level of van der Waals forces by reducing the mean particle size [12][13][14][15][16]; intensifying the amount of capillary force by the addition of a cohesive agent into the bed [17,18]; application of a magnetic field around the bed [19][20][21]; and increasing the bed temperature to a high value while cured particles, doped silica catalysts and Ballotini particles with the potassium acetate, were used as bed materials [10,11].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of a gas–solid fluidized bed with thermally induced interparticle forces

Shabanian

Chaouki

2015

Chemical Engineering Journal

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“…At the same time, the first practical applications based on MFBs were being envisaged [74][75][76][77][78]. During the next two decades, the improvement of experimental devices and techniques for the synthesis of magnetizable particles cleared the way to further research on the effect of the imposed magnetic field orientation [79,80] or the use magnetizable particles with tailored properties [81][82][83][84][85] as well as gas-liquid-solid admixtures [86][87][88]. New industrial applications have emerged in bioreactors [89,90] and aerosol filtration [91].…”

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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Hydrodynamic characteristics of a magnetically stabilized air fluidized bed of an admixture of magnetic and non-magnetic particles

Cited by 40 publications

References 4 publications

Hydrodynamic characteristics of magnetically stabilized fluidized admixture beds of iron and copper particles

Hydrodynamic characteristics of magnetically stabilized fluidized admixture beds of iron and copper particles

Hydrodynamics of a gas–solid fluidized bed with thermally induced interparticle forces

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

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