Experimental Study and Numerical Simulation of Gas–Liquid Two-Phase Flow in Aeration Tank Based on CFD-PBM Coupled Model

Dong, Liang; Guo, Jinnan; Liu, Jiawei; Liu, Houlin; Dai, Caili

doi:10.3390/w12061569

Cited by 10 publications

(11 citation statements)

References 19 publications

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“…In the traditional liquid-liquid extraction, the organic phase and aqueous phase are layered up and down by using the difference of their density, but others pointed out through theoretical derivation and experimental observation that in the micron channel, the gravity effect caused by the difference of relative surface tension and density between the two phases can be ignored [ 14 ]. The theoretical derivation is as follows:…”

Section: Methodsmentioning

confidence: 99%

[Retracted] Application of CFD Numerical Simulation Image Imaging Technology in the Study of Droplet Microfluidic Multiphase Flow Characteristics

2022

Contrast Media & Molecular Imaging

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In order to study the problem that the flow in the internal channel of the microfluidic chip is different from that of the macroscopic system by the FD numerical simulation image imaging technology. Taking the liquid-liquid extraction of microfluidic chip as the research object, this paper analyzes the theoretical basis, working principle, structural parameters, and the influence of working parameters on the fluid flow of liquid-liquid extraction. The results are as follows: when the inlet velocity of flowing liquid is 10^(−5) m/s, the diffusion efficiency can still be maintained at 95%; the double ψ-type aqueous phase showed laminar flow, the two-phase contact interface increased compared with the bottom flow rate, and the extraction efficiency increased to 98%; the extraction efficiency of double ψ type is higher than that of double Y-type: when the flow velocity ratio increases from v a q : v oil = 1 : 2 to v a q : v oil = 5 : 1 , the extraction efficiency increases to 99.8%; the experimental extraction efficiency is compared with the diffusion efficiency simulated by simulation. The diffusion efficiency of the cross type is 1.05 times that of the extraction efficiency, and that of the cylindrical type is 1.04 times that of the extraction efficiency. In this study, CFD is used to simulate the characteristics of droplet microfluidic multiphase flow, which enriches the theoretical method and research experience of liquid-liquid laminar flow.

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Section: Methodsmentioning

confidence: 99%

[Retracted] Application of CFD Numerical Simulation Image Imaging Technology in the Study of Droplet Microfluidic Multiphase Flow Characteristics

2022

Contrast Media & Molecular Imaging

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“…Zhang [13] used single-factor analysis and orthogonal test methods to find the optimal working conditions of the aerator. Guo [14] mainly used the PBM model to simulate the aeration process, which has high accuracy for a gas-liquid two-phase flow. Liu [15] obtained the real-time flow streamline of the inverted umbrella aerator, using a simulated gas-liquid flow.…”

Section: Text Model and Devicesmentioning

confidence: 99%

Experimental Study of a Gas-Liquid-Solid Three-Phase Flow in an Aeration Tank Driven by an Inverted Umbrella Aerator

Hua

et al. 2022

Processes

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The three-phase flow in a aeration tank driven by an inverted umbrella aerator is relatively complex, including the processes of the hydraulic jump, air entrainment, and sludge particle sedimentation. A three-phase flow test bench for an inverted umbrella aerator is established for studying its influence on aeration performance. The experiment mainly studies the changed law of aeration performance under different immersion depths or sludge concentrations and measures the flow rate and sludge concentrations in the aeration tank in different working conditions. The results are as follows. (1) The total oxygen transfer coefficient, standard oxygenation capacity, and standard power efficiency increase with the increase in rotational speed. The total oxygen transfer coefficient and standard-charge oxygen capacity first increase and then decrease with the decrease in immersion depth, reaching a maximum at −20 mm immersion depth. The standard dynamic efficiency has a similar trend and reaches a maximum at −8 mm immersion depth. (2) In the aeration tank, the flow velocity near the impeller is faster and has greater turbulence. The shallow water is more profoundly affected by the impeller compared with the deeper water. (3) The shallow-water sludge varies greatly, and the deep-water sludge is distributed uniformly when the inverted umbrella aerator works stably.

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“…(7). e population balance model (PBM) is used to describe the size distribution of the dispersed phase in the simulation, and the bubble diameter and proportion are determined by high-speed photography experimental results (Dong et al, 2020). e Luo-model, which considers bubble coalescence and fragmentation, is coupled (Zhang et al, 2018).…”

Section: Internal Ow Analysismentioning

confidence: 99%

Optimization of Aeration Performance for Inverted Umbrella Aerator Based on Response Surface Methodology

Dong

Guo

Liu

et al. 2021

J. Chem. Eng. Japan

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The aeration performance of inverted umbrella aerator is optimized through response surface methodology. The Box-Behnken design (BBD) method is used to design the experimental scheme, and three variables (blade number, plate tilt angle and plate gap opening) are selected to optimize the structure of the inverted umbrella aerator impeller and improve the aeration performance. The corresponding response value is obtained by experiments through the established scheme. The regression model is tted through the response value, and the variance analysis is performed on the regression model to test the signi cance of the model. The results show that the P-value is less than 0.05. Therefore, the model is signi cant and ts well in the regression area. The e ect of the blade number and the plate tilt angle on the target is signi cant, while plate gap opening is not signi cant. The inverted umbrella aerator has the best aeration performance when the number of the blades is 6, the plate tilt angle is 65° and the plate gap opening is 16.07%. The aeration performance and ow eld before and after optimization are compared. It shows that the standard oxygen mass transfer coe cient after optimization increases by 1.59%, and the standard aeration e ciency increases by 4.78%. The ow becomes more intense after optimization. The oxygen mass transfer process is further strengthened, and the aeration performance of inverted umbrella aerator is optimized.

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Experimental Study and Numerical Simulation of Gas–Liquid Two-Phase Flow in Aeration Tank Based on CFD-PBM Coupled Model

Cited by 10 publications

References 19 publications

[Retracted] Application of CFD Numerical Simulation Image Imaging Technology in the Study of Droplet Microfluidic Multiphase Flow Characteristics

[Retracted] Application of CFD Numerical Simulation Image Imaging Technology in the Study of Droplet Microfluidic Multiphase Flow Characteristics

Experimental Study of a Gas-Liquid-Solid Three-Phase Flow in an Aeration Tank Driven by an Inverted Umbrella Aerator

Optimization of Aeration Performance for Inverted Umbrella Aerator Based on Response Surface Methodology

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