Modeling the Mean Residence Time of Liquid Phase in the Gas–Liquid Cyclone

Yang, Junwei; Zhang, Xupeng; Shen, Guoping; Xiao, Jiazhi; You-hai, Jin

doi:10.1021/acs.iecr.5b02617

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…In fact, the study of USLF is by no means limited to the GLCC separator. This kind of swirling liquid film is universal in any gas-liquid separators or pipes with tangential inlets (Ahmed et al, 2011); (Yang et al, 2015) or helical vanes (Kataoka et al, 2009); (Xiong et al, 2014); (Funahashi et al, 2018). Compared with the ordinary annular flow in a gas-liquid twophase pipe, the swirling liquid film has two distinct characteristics: 1) The movement of the liquid film includes not only an axial component but also a tangential component;…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flow Characteristics of Upper Swirling Liquid Film Based on the Eulerian Wall Film Model

Yue¹,

Chen²,

Wang³

et al. 2022

Front. Chem. Eng.

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The Upper Swirling Liquid Film (USLF) phenomenon that occurs in the upper cylinder of the Gas–Liquid Cylindrical Cyclone (GLCC) separator is the direct cause of the low separation efficiency of the liquid phase. In this study, first, the USLF formation and development were simulated by an improved Eulerian-EWF coupled simulated method. By introducing a profile-defined inlet boundary and considering entrainment droplet size distributions, the Eulerian-EWF method got reasonable results which agreed well with the experimental. Then, the flow characteristics and changing laws of the USLF including film thickness, film axial velocity, and film tangential velocity were analyzed by this method under different gas–liquid flow rates. It suggested that the liquid film thickness often reaches a maximum at the aspect ratio (z-z0)/D=(1.2–3.9) above the tangential inlet, and the film thickness appears to be more sensitive to the gas flow than to the liquid flow. For the film axial velocity, the direction of film velocity on the front and back sides seems to be generally opposite. Finally, typical distributions of the aforementioned USLF variables were presented and corresponded accordingly, and two obvious rules were found. One is that the position where the thickest liquid film is located always corresponds to the position where the axial film velocity turns from positive to negative for the first time. The other is that the tangential film velocity has a strong synchronous relationship with the film thickness. This research might provide somewhat valid information for the future LCO-prevented measurement in GLCC separators.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flow Characteristics of Upper Swirling Liquid Film Based on the Eulerian Wall Film Model

Yue¹,

Chen²,

Wang³

et al. 2022

Front. Chem. Eng.

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“…4 The GLCC separators were developed by the Tulsa University Separation Technology Projects team in 1995, and since then, different studies have been developed around the relevant parameters of design and operation. 5,6 For instance, Yang et al 7 studied the residence time of the liquid phase in a cyclonic separator, obtaining that the liquid residence time decreases with the increasing of droplets loading, while the decrease is smaller when the inlet velocity increases. On the other hand, the liquid residence time increases with the cylinder diameter.…”

Section: ■ Introductionmentioning

confidence: 99%

Numerical Simulation of a Natural Gas Cylindrical Cyclone Separator Using Computational Fluid Dynamics

Caceres

Prieto

Gonzalez

et al. 2019

Ind. Eng. Chem. Res.

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Gas–liquid separators are one type of surface facility among those used in oil fields. In this paper, the study of gas–liquid separation in a cylindrical cyclone separator (GLCC) using computational fluids dynamics was carried out. The multiphase mixture model and the k–ε turbulence model in an air–water mixture with different geometries of the separator varying the inlet angle from 27° to 36° and 45° were used. Later, variables for the volumetric fraction, velocity, and pressure drop in the separator were studied. Finally, a natural gas mixture from a Colombian oil field was simulated using a species transport model. The results showed that a 36° inlet is the most suitable for the separation process due to its capacity to form a high-intensity swirl without produced liquid carry over. Also, it was found that the centrifugal separator could be a suitable alternative compared with conventional gravitational gas–liquid separators.

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“…Assuming that all of the liquid was gathered at the wall of the cyclone to form the liquid film under the impact of the centrifugal force, he derived a theoretical liquid film residence time calculation model based on the force balance on the gas and liquid phase in the axial direction. To verify the accuracy of the Hoffmann model, Yang et al 22 performed a cold model experiment to investigate the average liquid film residence time in a gas-liquid cyclone using a holdup method. The experimental results showed that the liquid residence time obviously decreased with an increase in inlet liquid holdup and decreased less with an increase in inlet gas velocity.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and effective distance of gas–liquid two-phase swirling flow induced by vortex tools

Zhang

Liao

Liu

2018

Advances in Mechanical Engineering

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Based on the mechanistic model of the two-phase swirling annular flow behavior, a calculation method for the effective distance of vortex tool is obtained by taking Kelvin-Helmholtz instability into account. The rationality of the proposed method is validated by comparing the predicted liquid film thickness and pressure under non-swirling flow with the commonly used correlations. Then, the influences of gas-liquid ratio, helix angle, and hub diameter of vortex tool on the liquid film thickness, pressure drop, and effective distance have been analyzed. Results show that the presence of the vortex tool causes the decrease in the liquid film thickness and increase in the pressure drop. The liquid film thickness increases gradually as the helix angle and the hub diameter increase, and the larger helix angle results in smaller pressure drop. The effective distance increases with an increase in the gas-liquid ratio and decreases with an increase in helix angle and hub diameter. A sudden decrease occurs when the helix angle exceeds 60°. The gas-liquid ratio and helix angle are more dominant factors than the hub diameter on the liquid film thickness, pressure drop, and effective distance.

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Modeling the Mean Residence Time of Liquid Phase in the Gas–Liquid Cyclone

Cited by 5 publications

References 29 publications

Numerical Analysis of Flow Characteristics of Upper Swirling Liquid Film Based on the Eulerian Wall Film Model

Numerical Analysis of Flow Characteristics of Upper Swirling Liquid Film Based on the Eulerian Wall Film Model

Numerical Simulation of a Natural Gas Cylindrical Cyclone Separator Using Computational Fluid Dynamics

Dynamics and effective distance of gas–liquid two-phase swirling flow induced by vortex tools

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