Sparged loop reactors

Joshi, Jyeshtharaj B.; Ranade, V. V.; Gharat, S.D.; Lele, S. S.

doi:10.1002/cjce.5450680501

Cited by 154 publications

(77 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is because the larger hydrodynamic resistance in the ELAMR caused lower W LD that induced more intensive bubble coalescence. Joshi et al (1990) and Bendjaballah et al (1999) also noted that the resistance in the ELAR, and thereby W LD , and the geometry of the downcomer influenced the regime transitions. On the other hand, Vial et al (2002) reported that the hydrodynamic resistance had a minor influence on the regime transitions.…”

Section: Hydrodynamic Regimesmentioning

confidence: 94%

Hydrodynamics of an external-loop airlift reactor with inserted membrane

Kojić

Popović

Tokic

et al. 2017

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-The objective of this study was to investigate the hydrodynamics of an external-loop airlift membrane reactor (ELAMR). The ELAMR was operated in two modes: without (mode A) and with bubbles in the downcomer (mode B), depending on the liquid level in the gas separator. The influence of the gas distributor's geometry and various alcohol solutions on the hydrodynamics of the ELAMR was studied. Results for the gas holdup and the downcomer liquid velocity are commented with respect to an external-loop airlift reactor of the same geometry but without the membrane in the downcomer (ELAR). Due to the presence of the membrane in the downcomer, acting as the local hydrodynamic resistance, the gas holdup in the riser of the ELAMR increases maximally by 16%, while the liquid velocity in the downcomer decreases up to 50%. The values of the gas holdup and liquid velocity predicted by the application of empirical power law correlations and a feed forward back propagation neural network (ANN) are in very good agreement with experimental values.

show abstract

Section: Hydrodynamic Regimesmentioning

confidence: 94%

Hydrodynamics of an external-loop airlift reactor with inserted membrane

Kojić

Popović

Tokic

et al. 2017

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Some of the applications of these are discussed in the subsequent sections. The governing equations for single phase flows, the EulerianEulerian approach and volume of fluid approach may be found in many text books (for example, Ranade [106], Ranade and coworkers [18,19,54,[108][109][110], and manuals of commercial CFD vendors). These are, therefore, not repeated and discussed here.…”

Section: International Journal Of Chemical Engineeringmentioning

confidence: 99%

CFD Simulation of Annular Centrifugal Extractors

Vedantam

Wardle

Tamhane

et al. 2012

International Journal of Chemical Engineering

Self Cite

View full text Add to dashboard Cite

Annular centrifugal extractors (ACE), also called annular centrifugal contactors offer several advantages over the other conventional process equipment such as low hold-up, high process throughput, low residence time, low solvent inventory and high turn down ratio. The equipment provides a very high value of mass transfer coefficient and interfacial area in the annular zone because of the high level of power consumption per unit volume and separation inside the rotor due to the high g of centrifugal field. For the development of rational and reliable design procedures, it is important to understand the flow patterns in the mixer and settler zones. Computational Fluid Dynamics (CFD) has played a major role in the constant evolution and improvements of this device. During the past thirty years, a large number of investigators have undertaken CFD simulations. All these publications have been carefully and critically analyzed and a coherent picture of the present status has been presented in this review paper. Initially, review of the single phase studies in the annular region has been presented, followed by the separator region. In continuation, the two-phase CFD simulations involving liquid-liquid and gas-liquid flow in the annular as well as separator regions have been reviewed. Suggestions have been made for the future work for bridging the existing knowledge gaps. In particular, emphasis has been given to the application of CFD simulations for the design of this equipment.

show abstract

“…Weiland and Onken [12], Verlaan [13], Gavrilescu and Tudose [14], and Vial et al [15] have performed experimental studies and reported values of axial dispersion coefficients in the risers of external loop airlift reactors. Joshi et al [16] have done a detailed hydrodynamic modeling of different sections of external loop air lift reactors and have proposed a unified correlation for the axial dispersion coefficient D L . Recently, Roy et al [17] have performed extensive CFD analyses of the flow and axial dispersion phenomena in the riser of an external loop airlift reactor.…”

Section: Introductionmentioning

confidence: 99%

Effect of Liquid Velocity on Axial Mixing in Gas‐Liquid Dispersions: A CFD Simulation

Roy

Joshi

2006

Chem Eng & Technol

Self Cite

View full text Add to dashboard Cite

A CFD analysis has been carried out to elucidate the characteristic features of axial mixing in gas-liquid dispersed upflow when the flow changes between two extremes: from bubble column, with very low/no liquid velocity, to pipe flow with very high liquid velocity. The CFD model was validated by simulating flow both in multiphase and in single phase. An agreement was observed between the predictions and the experimental data available in the published literature. The validated CFD model has been extended for the simulation of the axial dispersion coefficient for both multiphase and single phase. CFD predictions of the axial dispersion coefficient show good agreement with experimental values published in the literature. A systematic numerical study was done by varying the superficial liquid velocity, from a very low value to a very high value, to understand its effect on axial dispersion.

show abstract

Sparged loop reactors

Cited by 154 publications

References 82 publications

Hydrodynamics of an external-loop airlift reactor with inserted membrane

Hydrodynamics of an external-loop airlift reactor with inserted membrane

CFD Simulation of Annular Centrifugal Extractors

Effect of Liquid Velocity on Axial Mixing in Gas‐Liquid Dispersions: A CFD Simulation

Contact Info

Product

Resources

About