Investigation on hydrodynamics and mass transfer characteristics of a gas-liquid ejector using three-dimensional CFD modeling

Utomo, Tony Suryo; Jin, Zhenhua; Rahman, M. Sq.; Jeong, Hyomin; Chung, Hanshik

doi:10.1007/s12206-008-0614-3

Cited by 32 publications

(13 citation statements)

References 17 publications

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“…Jet ejectors have favorable mixing and mass transfer characteristics so they are more used among other gas-liquid contactors. A jet ejector is a device in which suction, mixing, and dispersal of secondary fluid take place and are based on the principle of utilizing the kinetic energy of a high velocity motive (primary) fluid jet to entrain the secondary phase to create fine dispersion of two phases (Utomo et al [39]). The secondary fluid may be dispersed by the shearing action of the high velocity motive fluid or motive fluid may get dispersed when it is captured by a secondary fluid [40].…”

Section: Jet Ejectormentioning

confidence: 99%

“…The numbers of researchers have attempted to optimize performance of jet ejector [40,51,[54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71] due to its increasing growth rate in usage. Many researchers have studied the mass transfer characteristics and performance of the jet ejectors followed by contactors, draft tube, packed column, or bubble column and they have similar conclusion that there is less mass transfer coefficient in the extended portion in comparison to the ejector [31,34,39,56,[69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87]. Dutta et al [74] and Gamisans et al [60] studied the jet ejectors and observe that jet ejector without diffuser or throat is less effective in comparison to ejector with them.…”

Section: Jet Ejectormentioning

confidence: 99%

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Numerical Simulation of Bubble Coalescence and Break-Up in Multinozzle Jet Ejector

Patel

Chaudhari

Лаари

et al. 2016

Journal of Applied Mathematics

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Designing the jet ejector optimally is a challenging task and has a great impact on industrial applications. Three different sets of nozzles (namely, 1, 3, and 5) inside the jet ejector are compared in this study by using numerical simulations. More precisely, dynamics of bubble coalescence and breakup in the multinozzle jet ejectors are studied by means of Computational Fluid Dynamics (CFD). The population balance approach is used for the gas phase such that different bubble size groups are included in CFD and the number densities of each of them are predicted in CFD simulations. Here, commercial CFD softwareANSYS Fluent 14.0is used. The realizablek-εturbulence model is used in CFD code in three-dimensional computational domains. It is clear that Reynolds-Averaged Navier-Stokes (RANS) models have their limitations, but on the other hand, turbulence modeling is not the key issue in this study and we can assume that the RANS models can predict turbulence of the carrying phase accurately enough. In order to validate our numerical predictions, results of one, three, and five nozzles are compared to laboratory experiments data for Cl2-NaOH system. Predicted gas volume fractions, bubble size distributions, and resulting number densities of the different bubble size groups as well as the interfacial area concentrations are in good agreement with experimental results.

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Section: Jet Ejectormentioning

confidence: 99%

Section: Jet Ejectormentioning

confidence: 99%

Numerical Simulation of Bubble Coalescence and Break-Up in Multinozzle Jet Ejector

Patel

Chaudhari

Лаари

et al. 2016

Journal of Applied Mathematics

View full text Add to dashboard Cite

show abstract

“…The turbulence model used in this calculation is the k-ε model. Among the k-ε models, the Standard k-ε model/ high Reynolds number was selected because it is the most widely used validated model in terms of consistency and reliability, and it also consumes less computer time [9,14,15]. The near wall treatment was left as the standard wall function, which gives reasonably accurate results for a wall bounded with high Reynolds number flow.…”

Section: Cfd Modelingmentioning

confidence: 99%

Optimization the design of venturi gas mixer for syngas engine using three-dimensional CFD modeling

et al. 2011

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A venturi mixer prototype is developed for mixing air and synthesis gas or "syngas" as a fuel. Syngas is recognized as a viable energy source worldwide, particularly for stationary power generation. It has a very low energy density, so a mixer with λ (ratio of actual to stoichiometric air-fuel ratio) in the range of 1.1 to 1.7 is expected. In this study, three-dimensional computational fluid dynamics (CFD) modeling is used to investigate and analyze the influence of the throat diameter, gas chamber thickness and gas exits diameter on mixer characteristics and performance. Attention is focused on the effect of venturi mixer geometry on the air-fuel ratio, pressure loss and mixing quality. Based on the numerical results, an optimized design of venturi gas mixer is made. The optimized design has λ in the range of 1.2 to 1.3, and gives very good mixing quality and acceptable pressure loss. The CFD results are validated with experimental data. The CFD results show good agreement with experimental data.

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“…Several efforts have been made to develop computational fluid dynamics (CFD) based models for simulating gas induction in gas -liquid ejector. Yadav et al, Kim et al and Yamoto et al have used the Eulerian -Eulerian (EE) and mixture model approach to model gas induction [21,22,23,25] . Kandakure et al [24] have developed CFD methodology for estimating gas induction using the two phase mixture model framework.…”

Section: Introductionmentioning

confidence: 99%

Estimation of gas induction in jet loop reactors: Influence of nozzle designs

Sharma

Patwardhan

Ranade

2017

Chemical Engineering Research and Design

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Jet loop reactors are used widely for conducting gas liquid reactions because of the high mass transfer achieved in the gas-liquid ejector. Studies have shown that the mass transfer has a very strong correlation to the amount of gas induced in the ejector, and hence it is important to understand gas induction to enhance the performance of any gas-liquid nozzle. In this work, we used a single phase CFD model of the ejector with one adjustable parameter for estimating gas induction rates. After establishing that the model adequately describes the experimental data, the model was used for a quick evaluation of ejector geometries. Influence of key geometric parameters of gas-liquid ejectors like nozzle diameter, mixing tube length, distance between the nozzle outlet and mixing tube, suction chamber geometry and diffuser angle was investigated. It was found that dependence of gas induction on geometric parameters like distance between nozzle-mixing tube, suction chamber geometry, diffuser angle was either weak or had a clear maxima at or beyond a certain value of the geometric parameter. Other parameters like mixing tube length and nozzle diameter have a more complex impact on gas induction. The presented approach and results will be useful for quantifying influence of nozzle designs on gas induction rate in jet loop reactors.

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Investigation on hydrodynamics and mass transfer characteristics of a gas-liquid ejector using three-dimensional CFD modeling

Cited by 32 publications

References 17 publications

Numerical Simulation of Bubble Coalescence and Break-Up in Multinozzle Jet Ejector

Numerical Simulation of Bubble Coalescence and Break-Up in Multinozzle Jet Ejector

Optimization the design of venturi gas mixer for syngas engine using three-dimensional CFD modeling

Estimation of gas induction in jet loop reactors: Influence of nozzle designs

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