Liquid drainage in inclined packed beds—Accelerating liquid draining time via column tilt

Assima, Gnouyaro P.; Hamitouche, A.; Schubert, Markus; Larachi, Faı̈çal

doi:10.1016/j.cep.2015.06.021

Cited by 16 publications

(18 citation statements)

References 20 publications

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“…The liquid waves at the middle ( H = 70 cm) and bottom ( H = 125 cm) of the inclined bed revealed a two‐step drainage dynamics. This trend was also reported by Schubert et al and Assima et al who investigated the effect of column inclination angles on the drainage dynamics of flooded packed beds. They ascribed this two‐step drainage to decomposition of the conventional one‐component gravitational force into the column‐wise and normal components by the column inclination.…”

Section: Resultssupporting

confidence: 84%

“…Their results divulged a reduction of both the two‐phase pressure drop and liquid saturation as well as worsening of phase maldistribution similar to slanted trickle beds. Likewise, Assima et al proposed column inclination to accelerate liquid draining rate in packed beds. They employed an ECT sensor to monitor liquid saturation profiles and textural flow regimes in different bed tilt angles.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Dashliborun

Larachi

Hamidipour³

2016

AIChE Journal

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The hydrodynamics of a periodically operated packed bed subjected to column oscillations and obliquity was studied. Electrical capacitance tomography (ECT) and capacitance wire mesh sensors were employed to measure the local instantaneous liquid saturation in stationary slanted and moving packed beds, respectively. A swell simulator with sixdegree-of-freedom motions was applied to emulate the behavior of floating packed beds. The results revealed that column inclination from the vertical position considerably decayed liquid waves excited by different cyclic operation strategies. However, ON-OFF liquid and gas/liquid alternating cyclic operations showed an attempt to conserve wave identity in the slanted bed and to decrease phase maldistribution resulting from bed inclination. It was also found that symmetric and non-symmetric split ratios of ON-OFF liquid cyclic mode were able to noticeably decrease fluid maldistribution in the oscillating packed bed. This study opens up possible prospects for process intensification of floating packed bed reactors and contactors.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Dashliborun

Larachi

Hamidipour³

2016

AIChE Journal

View full text Add to dashboard Cite

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“…With higher liquid holdup, it is more likely that the liquid phase flows rather in bulk and is less distributed by the resistance of the solid. This has also been verified in a recent experimental study by Assima et al [46] Here, faster liquid draining was observed for high interstitial liquid saturation. Hence, the tortuosity factor is inversely proportional to the liquid holdup as introduced by Attou et al [6]…”

Section: Preliminary Considerationssupporting

confidence: 85%

Multiphase flow modelling in moderately rotating inclined porous media

2016

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Advective and diffusive multiphase flows through vertical porous media are well examined and discussed in the scientific literature. However, uncommon configurations with inclined porous media are examined to a lesser extent, while advanced configurations with superimposed motion have hitherto scarcely been addressed. An example of such configuration is the inclined rotating tubular fixed bed reactor, which is a novel intensified multiphase reactor for heterogeneous catalytic gas‐liquid‐solid reactions (H.‐U. Härting, R. Lange, F. Larachi, M. Schubert, Chem. Eng. J. 2015, 281, 931). For the prediction of liquid saturation and two‐phase pressure drop in inclined and moderately rotating confined porous media, a two‐fluid model is presented. The model is one‐directional, isothermal, and considers incompressible Newtonian fluids. To account for the interphase momentum transfer, adopted Ergun‐type closures are formulated taking the peculiarities of stratified, dispersed, and annular flow into account. The effects of inclination and rotation are incorporated as additional body forces, whereby inclination is taken into account by the longitudinal gravity component and a semi‐empirical closure for the complex effects of the rotational velocity is presented. The applicability of the model is validated against experimental liquid saturation and two‐phase pressure drop data.

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“…For additional details on the application of ECT technique, data processing, and validation in the vertical and inclined packed beds, our group's previous studies can be consulted. 7,12,17,[35][36][37] Eulerian CFD Model A 3D unsteady-state Eulerian multifluid CFD model was used to simulate the hydrodynamics of inclined gas-liquid cocurrent downflow packed beds under cyclic operation. The Eulerian approach treated gas, liquid, and solid phases as mutually interacting interpenetrating continua.…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamics of inclined packed beds under flow modulation ‐ CFD simulation and experimental validation

Dashliborun

Hamidipour²,

Larachi

2017

AIChE Journal

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A three‐dimensional unsteady‐state Eulerian multi‐fluid CFD model was developed to simulate the hydrodynamic behavior of inclined gas‐liquid cocurrent downflow packed beds under ON‐OFF liquid, ON‐OFF gas, and gas/liquid alternating cyclic operations. Validation of the CFD simulation results was performed with experimental data provided by electrical capacitance tomography imaging. Incorporation in the Eulerian multifluid CFD model of capillary pressure and mechanical dispersion force was essential to accurately capture the transient spatial heterogeneities arising in tilted packed beds under different cyclic modulation strategies. The applied CFD model was able to satisfactorily predict the values of liquid holdup and pressure drop as well as the morphological characteristics of the traveling waves inside the bed for the examined flow modulations. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4161–4176, 2017

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Liquid drainage in inclined packed beds—Accelerating liquid draining time via column tilt

Cited by 16 publications

References 20 publications

Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Cyclic operation strategies in inclined and moving packed beds—Potential marine applications for floating systems

Multiphase flow modelling in moderately rotating inclined porous media

Hydrodynamics of inclined packed beds under flow modulation ‐ CFD simulation and experimental validation

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