Numerical and experimental investigations of gas–liquid dispersion in an ejector

Kim, Myoung Il; Kim, Og Sin; Lee, Dong Hoon; Kim, Sang Done

doi:10.1016/j.ces.2007.08.020

Cited by 38 publications

(26 citation statements)

References 13 publications

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“…In this context, numerical and experimental studies were made, showing that there was an optimum area ratio, at which the liquid entrainment rate was the highest. The liquid entrainment rate increased with the pressure difference between the water surface in the suction chamber and the throat exit for a wide variety of ejector geometries and operating conditions [40,[75][76][77]. For example, the Kandakure et al [76] use of two-phase ejector as a liquid-gas contactor, relied on CFD in order to assess the hydrodynamic characteristics with reference to the ejector geometry.…”

Section: Applications Potential Of the Two-phase Ejectormentioning

confidence: 99%

“…Due to their favorable mass transfer and mixing characteristics, ejectors are being increasingly used in diverse processes of this industry. In this respect, the work of Kim et al [75] is an example of such an application. Effects of the ejector geometry and the operating conditions on the hydraulic characteristics in a rectangular bubble column with a horizontal flow ejector were analyzed.…”

Section: Experiments On Ejectorsmentioning

confidence: 99%

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Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

et al. 2019

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Two-phase ejectors play a major role as refrigerant expansion devices in vapor compression systems and can find potential applications in many other industrial processes. As a result, they have become a focus of attention for the last few decades from the scientific community, not only for the expansion work recovery in a wide range of refrigeration and heat pump cycles but also in industrial processes as entrainment and mixing enhancement agents. This review provides relevant findings and trends, characterizing the design, operation and performance of the two-phase ejector as a component. Effects of geometry, operating conditions and the main developments in terms of theoretical and experimental approaches, rating methods and applications are discussed in detail. Ejector expansion refrigeration cycles (EERC) as well as the related theoretical and experimental research are reported. New and other relevant cycle combinations proposed in the recent literature are organized under theoretical and experimental headings by refrigerant types and/or by chronology whenever appropriate and systematically commented. This review brings out the fact that theoretical ejector and cycle studies outnumber experimental investigations and data generation. More emerging numerical studies of two-phase ejectors are a positive step, which has to be further supported by more validation work.

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Section: Applications Potential Of the Two-phase Ejectormentioning

confidence: 99%

Section: Experiments On Ejectorsmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

et al. 2019

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show abstract

“…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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“…An ejector can be single-phase (e.g., liquid-liquid and gas-gas ejector) or multiphase (e.g., liquid-gas and liquidsteam ejectors) [4][5][6][7][8][9][10][11][12][13]. For example, detailed experiments and computational fluid dynamics (CFD) numerical studies were undertaken to understand the hydrodynamic characteristics of the ejector geometry [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Liquid-Gas Ejector Used for Shipping Ballast Water Treatment

Song¹,

Cao²,

Shin³

et al. 2014

Mathematical Problems in Engineering

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Shipping ballast water can have significant ecological and economic impacts on aquatic ecosystems. Currently, water ejectors are widely used in marine applications for ballast water treatment owing to their high suction capability and reliability. In this communication, an improved ballast treatment system employing a liquid-gas ejector is introduced to clear the ballast water to reduce environmental risks. Commonly, the liquid-gas ejector uses ballast water as the primary fluid and chemical ozone as the secondary fluid. In this study, high-pressure water and air, instead of ballast water and ozone, are considered through extensive numerical and experimental research. The ejector is particularly studied by a steady three-dimensional multiphase computational fluid dynamics (CFD) analysis with commercial software ANSYS-CFX 14.5. Different turbulence models (including standardk-ε, RNGk-ε, SST, andk-ω) with different grid size and bubble size are compared extensively and the experiments are carried out to validate the numerical design and optimization. This study concludes that the RNGk-εturbulence model is the most efficient and effective for the ballast water treatment system under consideration and simple change of nozzle shape can greatly improve the ejector performance under high back pressure conditions.

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Numerical and experimental investigations of gas–liquid dispersion in an ejector

Cited by 38 publications

References 13 publications

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

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

Numerical Investigation of a Liquid-Gas Ejector Used for Shipping Ballast Water Treatment

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