Onset of pulsing in trickle beds with non-Newtonian liquids at elevated temperature and pressure—Modeling and experimental verification

Iliuta, Ion; Aydin, Bora; Larachi, Faı̈çal

doi:10.1016/j.ces.2005.07.004

Cited by 10 publications

(8 citation statements)

References 43 publications

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“…A condition similar to Eq. (58) has been obtained by Grosser et al (1988), Dankworth and Sundaresan (1989), Attou and Ferschneider (2000) and Iliuta et al (2006) for trickle-bed reactors with Newtonian and non-Newtonian liquids, but the coefficients are different according to the model. Moreover, other terms in ψ 2 and ψ 5 coefficients associated with the present model did not appear in earlier models as the current version takes into account partial wetting of the structured packing-bed, the mechanical dispersion forces and the modified closure for the pressure difference between the phases given by capillary dispersion and gravity.…”

Section: Linear Stability Analysis Of Uniform Steady Statementioning

confidence: 99%

Flooding limit in countercurrent gas–liquid structured packed beds—Prediction from a linear stability analysis of an Eulerian two-fluid model

Iliuta¹,

Larachi²,

Fourati³

et al. 2014

Chemical Engineering Science

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Section: Linear Stability Analysis Of Uniform Steady Statementioning

confidence: 99%

Flooding limit in countercurrent gas–liquid structured packed beds—Prediction from a linear stability analysis of an Eulerian two-fluid model

Iliuta¹,

Larachi²,

Fourati³

et al. 2014

Chemical Engineering Science

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“…Gegenwärtig liegt der Fokus bei CFD-Simulationen in Rieselbettreaktoren vor allem auf der hydrodynamischen Analyse. Insbesondere wurden Studien zu Phasenanteil und Druckverlust (Jiang et al 2002b;Gunjal et al 2005;Atta et al 2007a), Phasenfehlverteilung (Boyer et al 2005;Atta et al 2007b;Lopes und Quinta-Ferreira 2009b;Lappalainen et al 2009) sowie Strömungsregimeübergang (Grosser et al 1988;Lopes und Quinta-Ferreira 2010b;Iliuta et al 2006) durchgeführt. Darüber hinaus wurden von der Gruppe um Prof. Larachi mittels CFD hydrodynamische Analysen zur Tiefenfiltration von Feinstpartikeln in regellosen Schüttungen, zur Verstopfung von Rieselbettbiorekatoren mit Biomasse und zur Hydrodynamik unter Einwirkung aufgeprägter magnetischer Felder durchgeführt.…”

Section: Rieselbettreaktormodellierung Mittels Computational Fluid Dyunclassified

Reaktoren für Dreiphasen-Reaktionen: Rieselbettreaktoren

Schubert¹

2019

Handbuch Chemische Reaktoren

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Der Einfluss von betrieblichen Bedingungen, Katalysatoreigenschaften und Reaktorabmessungen auf das Verhalten von Rieselbettreaktoren für heterogenkatalysierte Gas-Flüssig-Reaktionen wird illustriert. Dabei liegt der Schwerpunkt auf der Beschreibung der komplexen Hydrodynamik und der Transportprozesse sowie deren Berücksichtigung bei der Reaktormodellierung. Zusätzlich werden Aspekte der Prozessentwicklung auf Basis von Laborexperimenten beleuchtet und Kriterien zur Bewertung der Abweichung vom idealen Rohrreaktor diskutiert. Zur Überwindung von Stofftransportlimitierungen werden Intensivierungskonzepte für Rieselbettreaktoren vorgestellt. Der Beitrag wurde in einer vorigen Version versehentlich vorab veröffentlicht und wurde korrigiert.

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“…Liquid and gas superficial velocities at the transition decrease linearly with the local volume‐averaged specific deposit. Using a stability analysis, Iliuta et al (2006b) modelled the onset of pulsing in trickle beds for two‐phase flow with non‐Newtonian liquid. The model was developed for the versatile Herschel–Bulkley constitutive rheological equation from which special solutions for plastic Bingham fluids, power–law shear‐thinning and thickening fluids, as well as Newtonian fluids were derived.…”

Section: Cfd Modelling and Simulation Of Trickle‐bed Reaction Systemsmentioning

confidence: 99%

Modelling and simulation of trickle‐bed reactors using computational fluid dynamics: A state‐of‐the‐art review

2011

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Trickle-bed reactors (TBRs), which accommodate the flow of gas and liquid phases through packed beds of catalysts, host a variety of gas-liquid-solid catalytic reactions, particularly in the petroleum/petrochemical industry. The multiphase flow hydrodynamics in TBRs are complex and directly affect the overall reactor performance in terms of reactant conversion and product yield and selectivity. Non-ideal flow behaviours, such as flow maldistribution, channelling or partial catalyst wetting may significantly reduce the effectiveness of the reactor. However, conventional TBR modelling approaches cannot properly account for these non-ideal behaviours owing to the complex coupling between fluid dynamics and chemical kinetics. Recent advances in the application of computational fluid dynamics (CFD) to three-phase TBR systems have shown promise of achieving a deeper understanding of the interactions between multiphase fluid dynamics and chemical reactions. This study is intended to give a state-of-the-art overview of the progress achieved in the field of CFD simulation of TBRs over the past two decades. The fundamental modelling framework of multiphase flow in TBRs, advances in important constitutive models, and the application of CFD models are discussed in detail. Directions for future research are suggested.RÉSUMÉ Les lits fixes arrosésà co-courant descendant de gaz et de liquide sont le siège d'innombrables processus catalytiques triphasiques, en particulier dans le domaine du raffinage pétrolier et de la pétrochimie. Les caractères polyphasique et non-idéal de leur hydrodynamique ont des répercussions importantes sur la conversion chimique, la productivité et la sélectivité. Ceci se traduit par l'entremise de la maldistribution des fluides, le mouillage partiel du catalyseur ou desécoulements préférentiels qui peuventêtre déterminants en ce qui a traità l'efficacité du réacteur. La mise enéquation rigoureuse de ces non-idéalités et des couplages réaction-hydrodynamique a longtemps résisté aux approches de conceptualisation dites « conventionnelles ». Cette revue de synthèse s'attarde par conséquentà discuter les récentes avancées dans l'utilisation de la mécanique des fluides numérique comme outil «émergent et non-conventionnel » de description quantitative et fine desécoulements et des réactions catalytiques, et de leur interaction au sein de ces réacteurs. Spécifiquement, nous discuterons de la pertinence des différentes approches multi-fluides mises en oeuvre, des relations constitutives développées et de l'utilisation de la mécanique des fluides numérique pour des applications pratiques des lits fixes arrosés. Nous suggérerons en guise d'épilogue de nouvelles directions de recherche dans ce domaine.Mots clés: Lit fixe arrosé, mécanique des fluides numérique, hydrodynamique polyphasique,équations constitutives tive amination, liquid-phase oxidation, etc.). TBRs are also used for the catalytic abatement of aqueous biocidal compounds in *

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Onset of pulsing in trickle beds with non-Newtonian liquids at elevated temperature and pressure—Modeling and experimental verification

Cited by 10 publications

References 43 publications

Flooding limit in countercurrent gas–liquid structured packed beds—Prediction from a linear stability analysis of an Eulerian two-fluid model

Flooding limit in countercurrent gas–liquid structured packed beds—Prediction from a linear stability analysis of an Eulerian two-fluid model

Reaktoren für Dreiphasen-Reaktionen: Rieselbettreaktoren

Modelling and simulation of trickle‐bed reactors using computational fluid dynamics: A state‐of‐the‐art review

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