Hydrodynamic characteristics of a horizontal flow ejector in a rectangular chamber

Kim, Og Sin; Lee, Yoong; Lee, Dong Hoon

doi:10.1007/s11814-009-0050-9

Cited by 9 publications

(5 citation statements)

References 20 publications

(68 reference statements)

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“…The results show that the gas induction is not affected by the PR beyond the value 4.5 as shown in Figure 10. Similar observations were made by Bhutada et al [4] (PR > 4) and Yadav et al [25] (PR > 5) experimentally and in numerical studies respectively. This is indicative of the fact that after a certain length the momentum transfer between the primary and the secondary fluid slows down and the jet flows as a mixture of the two fluids.…”

Section: Resultssupporting

confidence: 88%

“…Hence, there is no significant impact of the suction chamber geometry on gas induction. Similar results were presented by Yadav et al [25] that the gas induction is independent of suction chamber geometry as long as 4  Influence of the distance between nozzle outlet and the mixing tube inlet on the gas induction was investigated. A new parameter called the projection ratio was defined as…”

Section: Resultssupporting

confidence: 66%

“…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%

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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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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

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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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“…There are many studies describing the hydrodynamic and mass transfer characteristics concerning multi-phase fluids with the conventional central-driven ejector [6]. The effects of various parameters such as primary nozzle area ratio, mixing tube length, diffuser angle and length on the ejector performance have been investigated by Sharma et al [7], Kim et al [8], Kumar et al [9], Rogdakis and Alexis [10], Rainer et al [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of Design Parameters on Air Entrainment and Oxygen Transfer of Central-Driven Ejector

Kim

et al. 2014

AMR

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The objective of this study is to investigate the air entrainment and oxygen transfer characteristics of central-driven ejector with various ejector design parameters. The ejector design parameters are primary nozzle diameter, mixing tube length and diffuser angle. The entrainment ratio decreased with the primary nozzle diameter and diffuser angle, while the ratio increased with the mixing tube length. The trend of dissolved oxygen concentration with the diffuser angle and mixing tube length is equal to the result of entrainment ratio, however, the trend with the primary nozzle diameter is different to the result of entrainment ratio.

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“…[45], [46]; Utomo et al [47]; Yadav and Patwardhan [44]. Kandakure et al [48] have developed CFD methodology for estimating gas induction using the two-phase mixture model framework.…”

Section: Numericalmentioning

confidence: 99%

An integrated modeling approach for design and optimization of ejector pumps carrying two-phase fluid

Almutairi¹

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An ejector pump uses a primary flow as a motive fluid to entrain another fluid, and can work with both incompressible flow and compressible flow, in either as a singlephase or two-phase mixture. Determining the behavior of the two-phase flow inside the ejector with different geometric parameters was the objective of this research. Three approaches were used to predict the performance and the capture the flow behavior inside it. An analytical model used the geometric parameters to calculate the loss factors for the first time and work as a basis for the two-phase flow ejectors. A fluid transportation system was built to verify analytical and numerical predictions and to explore optimum. Using a fitting parameter to capture the flow behavior inside the ejector was crucial for the accuracy of the numerical model. The fitting parameter is a new technique that uses an arbitrary fluid to match the induced air measurements numerically with the ones founded experimentally. To apply the three approaches, nine ejectors were built with different geometric parameters. The nozzle exit diameters are tested at three levels while the length mixing tube are tested at three levels as well. The results reveal that the diffuser angle of 5[degrees], the smallest nozzle exit diameter, and the longest mixing tube result on maximum efficiency and highest induced air. More investigation of two-phase ejectors is important to fully understand flow behavior and to increase efficiency. There are many improvements needed to this work in future.

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Hydrodynamic characteristics of a horizontal flow ejector in a rectangular chamber

Cited by 9 publications

References 20 publications

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

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

Effect of Design Parameters on Air Entrainment and Oxygen Transfer of Central-Driven Ejector

An integrated modeling approach for design and optimization of ejector pumps carrying two-phase fluid

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