Gas suction and mass transfer in gas-liquid up-flow ejector loop reactors. Effect of nozzle and ejector geometry

Opletal, M.; Novotný, Petr; Linek, V.; Moucha, T.; Kordač, M.

doi:10.1016/j.cej.2018.07.079

Cited by 28 publications

(11 citation statements)

References 29 publications

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“…Observe that pressure drops of about 80% of the upstream pressure were also obtained in previous studies on conventional gas-liquid ejectors (Kumar et al 2007, Yuan et al 2011). On the other hand, all the ejectors reached air entrainment ratios of up to about 1.7, which is within the maximum values of 0.3 -2.5 reported by previous researchers using from standard Venturi to more sophisticated types of ejectors (Baylar & Ozkan 2006, Yuan et al 2011, Park & Yang 2017, Opletal et al 2018. Again, no significant performance variation was observed for the different ejector types, which suggests that the shortest and simplest ejector (B) has a better benefit-cost ratio than the others (A1, A2 and A3).…”

Section: Resultssupporting

confidence: 87%

“…Ejectors have long been used for many purposes such as aeration, pumping and evaporation, with application in several areas of agricultural, civil, chemical, environmental and mechanical engineering, including water treatment, mixing, desalination, dredging, refrigeration, among others (Cunningham 1995, Wang & Wypych 1995, Winoto et al 2000, El-Dessouky et al 2002, Lima Neto & Porto 2004, Baylar & Ozkan 2006, Kumar & Mani 2007, Balamurugan et al 2007, Lima Neto et al 2008a, b, Lima Neto 2004, Yuan et al 2011, Opletal et al 2018, Park & Yang 2018.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on gas-liquid ejectors have focused on the experimental, theoretical and/ or numerical analysis of conventional devices, which are usually manufactured from five metallic parts: driving nozzle, suction nozzle, suction chamber, mixing chamber, and diffuser (Cunningham 1995, Lima Neto et al 2008a, b, El-Dessouky et al 2002, Kumar et al 2007, Lima Neto et al 2008a, b, Yuan et al 2011, Opletal et al 2018. The cost of the commercial ejectors used in these cases ranges from about $150 to $500 U.S. dollars for a 25 mm nominal diameter device.…”

Section: Introductionmentioning

confidence: 99%

“…Earlier experiments on Venturi and conventional gas-liquid ejectors normally investigated the maximum air-water entrainment ratios reached by these devices, which ranged from about 0.3 -2.5 (Baylar & Ozkan 2006, Yuan et al 2011, Park & Yang 2017, Opletal et al 2018. Another parameter normally investigated was the pressure drop over the ejector, which ranged from approximately 0.7 -0.9 of the upstream pressure (Kumar et al 2007, Yuan et al 2011.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Air entrainment and pressure drop in low-cost ejectors

Lima

Neto

2020

An. Acad. Bras. Ciênc.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Air entrainment and pressure drop in low-cost ejectors

Lima

Neto

2020

An. Acad. Bras. Ciênc.

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“…They are widely used as mixing devices or for pumping corrosive fluids, slurries, fumes and dust-laden gases. In chemical industries and in biochemical industry they are used in gas-liquid reactions, serve for absorption and stripping [74]. Ejectors produce high mass transfer rates by generating small bubbles/droplets, which can then be Deng et al [66] visual investigation of a two-phase ejector for a transcritical CO 2 cycle was based on a shadowgraph visualization approach.…”

Section: Applications Potential Of the Two-phase Ejectormentioning

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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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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Experimental investigation of bubble size evolution released from a fine bubble ejector

Tao

Huang

et al. 2023

Can J Chem Eng

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The effects of gas flow rate, liquid flow rate, and liquid properties on the bubble size evolution at the outlet zone of an ejector have been investigated systemically. The liquid properties, including surface tension and viscosity, were changed by adding glycerol, ethanol, or Carbopol 2020 into tap water. It was found that increasing the liquid flow rate is beneficial for producing smaller bubbles with a narrower size distribution in the ejector, while the gas flow rate investigated here shows less influence on the generated fine bubble diameter. An intense bubble coalescence phenomenon, which has a negative effect on mass transfer, was first observed at the small outlet zone of the ejector by exploring the bubble size evolution along the axial height. It was found that the mean diameter of the fine bubbles could increase by 48% ~ 90% when they rose only 25 cm from the ejector outlet, and the bubble coalescence could be effectively suppressed by adding a small amount of glycerol to water. The bubble diameter could be reduced by 32% ~ 43% by using a 2 wt.% glycerol solution under the experimental conditions. A comparative study with tap water, glycerol solution, Carbopol solution, and ethanol solution was taken, and the underlying mechanism of reducing the generated bubble size by changing the liquid properties was revealed.

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Gas suction and mass transfer in gas-liquid up-flow ejector loop reactors. Effect of nozzle and ejector geometry

Cited by 28 publications

References 29 publications

Air entrainment and pressure drop in low-cost ejectors

Air entrainment and pressure drop in low-cost ejectors

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

Experimental investigation of bubble size evolution released from a fine bubble ejector

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