Scale influence on the hydrodynamics of an internal loop airlift reactor

Blažej, M.; Kiša, Michal; Markoš, Jozef

doi:10.1016/j.cep.2004.02.003

Cited by 84 publications

(66 citation statements)

References 10 publications

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“…Overall gas holdup increased with increasing superficial gas velocity. Similar phenomena could be also observed in most internal airlift loop reactors (Blažej and Markoš, 2004;Contreras, et al, 1999;Lo and Hwang, 2003;Lu and Hwang, 1995). It is also seen in Fig.…”

Section: Local and Overall Gas Holdupsupporting

confidence: 69%

Hydrodynamics and mass transfer in a modified three-phase airlift loop reactor

Liu

Ming-xian

et al. 2007

Pet. Sci.

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A modified internal-loop airlift reactor (MIALR) with a continuous slurry phase was studied to investigate the local hydrodynamic characteristics, including gas holdup, bubble size, bubble rise velocity and local mass transfer properties. Based on the analysis of geometrical construction and fluid properties of gas and slurry, MIALR was divided into six flow regions. In these flow regions, the local hydrodynamic characteristics were investigated over a wide range of operating variables. Furthermore, a new method was developed to measure the dissolved oxygen concentration. The volumetric mass-transfer coefficient in six flow regions was also calculated for comparison.

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Section: Local and Overall Gas Holdupsupporting

confidence: 69%

Hydrodynamics and mass transfer in a modified three-phase airlift loop reactor

Liu

Ming-xian

et al. 2007

Pet. Sci.

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“…In addition, investigation of this parameter is important for regime identification (van Benthum et al, 1999;Blazej et al, 2004b). The gas holdup differences between the riser and downcomer at the superficial gas velocities used is shown in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

“…The gas holdup difference between the riser and downcomer (α gR -α gD ), as well as the ratio of them (α gR /α gD ) in those regions, are the useful and simple parameters frequently used by researchers to identify the circulating regime (van Benthum et al, 1999;Blazej et al, 2004b).…”

Section: Circulating Regime In the Ilalrsmentioning

confidence: 99%

Investigation of hydrodynamics and transition regime in an internal loop airlift reactor using CFD

Ghasemi

Hosseini

2012

Braz. J. Chem. Eng.

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-CFD modeling for an internal loop airlift reactor is developed for different superficial gas velocities, ranging from 0.015 to 0.073 m/s. Based on the presence of gas bubbles in the downcomer, three regimes can be generally classified as: no gas bubbles (I), stagnation of gas bubbles (II), and recirculation of gas bubbles into the riser (III). The aim of the study is to carefully investigate the regime transition from II to III by considering the gas distribution. In regime II, the CFD simulation results show that the gas holdup difference between the riser and the downcomer remains constant. Due to the transition from regime II to III, the gas holdup difference sharply increases and the ratio of gas holdup in the downcomer and riser changes between the two regimes. At a superficial gas velocity slightly lower than that of the transitional regime, a small amount of gas is dragged to the riser, while the behavior of the regime is similar to regime II. The computational results show that CFD can be used as an effective tool to provide information on the details of the transition regime in internal loop airlift reactors.

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“…), reactor geometry, structures of gas sparger and internals on these parameters is essential for the design and scale-up of ALRs. Extensive studies on the hydrodynamics in the airlift reactors have been reported in the last decades [6][7][8][9] and most of the work has been focused on the design of reactor structure and gas sparger [10][11][12][13]. Though some of the work has been reported on the optimization of the diameter and expansion angle of the straight/expanded draft tubes [14], very few work has been carried out to systematically study the influence of draft tube on the flexibility of operation, the gas liquid mixing/separation and the heat/mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Draft Tube Structure for the Pilot-Scale Airlift Reactors

Sun¹

2015

J Adv Chem Eng

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Scale influence on the hydrodynamics of an internal loop airlift reactor

Cited by 84 publications

References 10 publications

Hydrodynamics and mass transfer in a modified three-phase airlift loop reactor

Hydrodynamics and mass transfer in a modified three-phase airlift loop reactor

Investigation of hydrodynamics and transition regime in an internal loop airlift reactor using CFD

Optimization of Draft Tube Structure for the Pilot-Scale Airlift Reactors

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