Modeling of annular reactors with surface reaction using computational fluid dynamics (CFD)

Durán, J. Esteban; Mohseni, Madjid; Taghipour, Fariborz

doi:10.1016/j.ces.2009.09.075

Cited by 49 publications

(35 citation statements)

References 39 publications

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“…When analyzing the performance predictions obtained using different hydrodynamic models, it can be noticed that the laminar model was able to predict the photocatalytic rate for all the studied annular reactors. This result agrees with those of previous studies [11][12][23][24] in which the laminar model presented very good external mass transfer and surface reaction prediction performance.…”

Section: Cfd Simulations Of the Prototype Annular Reactorssupporting

confidence: 95%

“…In such systems, the prediction of the overall reactor performance will be largely determined by the external mass transfer prediction capabilities of the hydrodynamic models used for the simulations. 24 Comparison of the CFD simulations with the reactor experimental performances Several runs at different flow rates were performed, operating the immobilized photocatalytic reactor prototypes in recirculating batch mode. The photocatalytic degradation performance of the reactors was measured in terms of the apparent degradation rate constants (k app ) obtained under each experimental condition.…”

Section: Cfd Simulations Of the Prototype Annular Reactorsmentioning

confidence: 99%

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Computational fluid dynamics modeling of immobilized photocatalytic reactors for water treatment

2010

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A computational fluid dynamics (CFD) model for the simulation of immobilized photocatalytic reactors used for water treatment was developed and evaluated experimentally. The model integrated hydrodynamics, species mass transport, chemical reaction kinetics, and irradiance distribution within the reactor. The experimental evaluation was performed using various configurations of annular reactors and ultraviolet lamp sizes over a wide range of hydrodynamic conditions (350 \ Re \ 11,000). The evaluation showed that the developed CFD model was able to successfully predict the photocatalytic degradation rate of a model pollutant in the analyzed reactors. In terms of hydrodynamic models, the results demonstrated that the laminar model performs well for systems under laminar flow conditions, whereas the Abe-Kondoh-Nagano low Reynolds number and the Reynolds stress turbulence models give accurate predictions for photoreactors under transitional or turbulent flow regimes. The performed analysis confirmed that degradation rates of organic contaminants in immobilized photocatalytic reactors are strongly limited by external mass transfer; as a consequence, the degradation prediction capability of the CFD model is largely determined by the external mass transfer prediction performance of the hydrodynamic models used.

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Section: Cfd Simulations Of the Prototype Annular Reactorssupporting

confidence: 95%

Section: Cfd Simulations Of the Prototype Annular Reactorsmentioning

confidence: 99%

Computational fluid dynamics modeling of immobilized photocatalytic reactors for water treatment

2010

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“…CFD codes have also been used to model homogeneous and heterogeneous reactions by several authors [18][19][20][21][22][23][24]. For example, Dixon et al [21] studied diffusion and reaction for the endothermic methane steam reforming in a fixed bed reactor.…”

Section: Introductionmentioning

confidence: 99%

Comparison of CFD results and experimental data in a fixed bed Fischer–Tropsch synthesis reactor

Miroliaei

Shahraki

Atashi

et al. 2012

Journal of Industrial and Engineering Chemistry

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“…The CFD model has been successfully used to predict the fluid flow and pressure drop of fixed bed reactors (Calis et al, 2001), estimate diffusion and chemical reaction behavior with heat and mass transfer in porous catalyst pellets (Kolaczkowski et al, 2007), and investigate the surface kinetics of heterogeneous catalysts (Duran et al, 2010). For the purpose of heat transfer study, the first 3-dimensional CFD simulation of a packed bed structure was performed by Derkx and Dixon (1996).…”

Section: Introductionmentioning

confidence: 99%

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Sheng

Gonzalez

Yantz

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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Computational Fluid Dynamics (CFD) was used to compare the micro scale heat transfer inside a packed bed and a microfibrous entrapped catalyst (MFEC) structure. Simulations conducted in stagnant gas determined the thermal resistance of the gas in the micro gaps between the particle-to-particle contact points in the resistance network model of a packed bed. Tube to particle diameter ratios for the simulations were 9 based on particle diameter and 27 for MFEC based on surface area average diameter. The maximum temperature difference used in the simulations was 80°C. It was shown that thermal resistance at the contact points accounted for 90% of the thermal resistance of the solid path. In the MFEC, the thermal resistance of the continuous metal fibers was relatively smaller than that of contact points. As a result, 97.2% of the total heat flux was transported by continuous fiber cylinders, which was the fundamental function of fibers on improving the heat transfer of MFEC structures. Enhanced heat transfer characteristics of MFEC were further demonstrated by simulations performed in flowing gas, where both heat conduction and heat convection were significant.

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Modeling of annular reactors with surface reaction using computational fluid dynamics (CFD)

Cited by 49 publications

References 39 publications

Computational fluid dynamics modeling of immobilized photocatalytic reactors for water treatment

Computational fluid dynamics modeling of immobilized photocatalytic reactors for water treatment

Comparison of CFD results and experimental data in a fixed bed Fischer–Tropsch synthesis reactor

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

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