Effect of column inclination on the performance of three‐phase fluidized beds

Pozo, M. Del; Briens, Cédric; Wild, Gabriel

doi:10.1002/aic.690380808

Cited by 17 publications

(4 citation statements)

References 10 publications

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“…From a pragmatic standpoint, reactor column inclination may have detrimental or beneficial effects on the performance of the hosting vessel depending on the projected application. Inclined three‐phase and gas/liquid fluidized beds were explored in studies of flow regimes, their fluidization heterogeneity along with their corresponding heat and mass transfer characteristics (O'Dea et al, 1990; Del Pozo et al, 1992; Hudson et al, 1996; Yakubov et al, 2007; Valverde et al, 2008). While studying liquid maldistribution by means of a computer‐generated two‐dimensional trickle‐bed column of uniform spheres, Zimmerman and Ng (1986) considered the inclined configuration just for model predictions and validation.…”

Section: Introductionmentioning

confidence: 99%

Co‐current descending two‐phase flows in inclined packed beds: Experiments versus simulations

et al. 2010

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The effect of inclination angle of a packed bed on its corresponding gas-liquid flow segregation and liquid saturation spatial distribution was measured in co-current descending gas-liquid flows for varying inclinations and fluid velocities, and simulated using a two-phase Eulerian computational fluid dynamics framework (CFD) adapted from trickle-bed vertical configuration and based on the porous media concept. The model predictions were validated with our own experimental data obtained using electrical capacitance tomography. This preliminary attempt to forecast the hydrodynamics in inclined packed bed geometries recommends for the formulation of appropriate drag force closures which should be integrated in the CFD model for improved quantitative estimation.Résumé: Nous analysons l'effet de l'angle d'inclinaison d'un milieu poreux soumisà unécoulement biphasique gaz-liquide de haut en bas. L'analyse s'est attardée en particulier sur l'aptitudeà la ségrégation gaz-liquide et l'évolution de la saturation liquide en fonction de l'angle d'inclinaison et des vitesses de fluides. Une analyse théorique du phénomène de ségrégation y est effectuée par simulation de type mécanique des fluides numérique selon une approche Eulérienne de l'écoulement biphasique dans l'espace poreux du milieu granulaire. Un début de validation des simulations est discuté sur la base de la distribution spatiale des saturations liquides mesurées par tomographieélectriqueà capacitance. Les premières conclusions de ce travail montrent l'inadéquation relative des lois de fermeture sur les forces de frottement telles qu'elles ontété formulées pour lesécoulements biphasiques descendants verticaux; ce qui requiert des efforts futursà développer des lois de frottement plus adaptées aux géométries biphasiques inclinées.

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Section: Introductionmentioning

confidence: 99%

Co‐current descending two‐phase flows in inclined packed beds: Experiments versus simulations

et al. 2010

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“…They will k grouped into two sections: overall (average) and local phase holdup. (Hikita et al, 1980;Miller, 1980;Fan et al, 1985;Reilly et al, 1986;Wachi et al, 1987;Prakash, 1991;Del Pozo, 1992;Gandhi, 1997 (Akita and 'fahida, 1973;Kato et al, 1973;Grover et al. 1986;Hatate et al, 1986;Morooka et al, 1986;Ozturk et al, 1987 2)The design of gas and liquid sparger plays a vital role in limiting the magnitude of the erron.…”

Section: Phase Holdup Measurement Techniquementioning

confidence: 99%

Heat Transfer and Hydrodynamics in a Three-Phase Slurry Bubble Column

Prakash

1997

Ind. Eng. Chem. Res.

103

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The instantaneous and time-averaged heat transfer coefficients in the regions near the wall and at the center and average gas holdups were measured in a 0.28 m diameter slurry bubble column for the air−water and air−water−glass beads (35 μm) system. The effects of high gas velocities (up to 0.35 m/s) and high solids concentrations (up to 40 vol %) were investigated. Gas holdup decreased with increasing slurry concentrations; the rate of decline was rapid at high gas velocities. The instantaneous local heat transfer measurements were analyzed to study the bubble behavior in the regions near the wall and at the center for different solids concentrations. Larger bubbles were detected in the wall region in slurry systems compared to the solid-free system. The average heat transfer coefficient decreased with increasing slurry concentrations. The heat transfer coefficient was always lower at the wall than at the center.

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“…The collisions between the tracer particles and the electrodes were measured with an electrochemical method (Del Pozo et al, 1993;Barghi, 1997). The local collision frequency and its history were obtained at 16 locations inside the bed, using a data acquisition system.…”

Section: Methodsmentioning

confidence: 99%

Measurement of Solid Circulation Patterns in Liquid—Solid and Gas—Liquid—Solid Fluidized Beds

2003

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Solid circulation patterns were determined by measuring collisions between tracer particles and cylindrical probes in liquid—solid and gas—liquid—solid fluidized beds. Special probes were used to obtain two‐ and three‐dimensional views of particle motion. Circulation patterns for 3 and 5 mm glass beads were studied. Mixing cells, which had been formed at low liquid velocities, grew in size and eventually merged as the liquid velocity increased. The flow patterns of smaller particles having the same density as bed particles and particles lighter than bed particles (graphite particles) with the same size were also measured.

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Effect of column inclination on the performance of three‐phase fluidized beds

Cited by 17 publications

References 10 publications

Co‐current descending two‐phase flows in inclined packed beds: Experiments versus simulations

Co‐current descending two‐phase flows in inclined packed beds: Experiments versus simulations

Heat Transfer and Hydrodynamics in a Three-Phase Slurry Bubble Column

Measurement of Solid Circulation Patterns in Liquid—Solid and Gas—Liquid—Solid Fluidized Beds

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