Comprehensive particle image velocimetry measurement and numerical model validations on the gas–liquid flow field in a lab-scale cyclonic flotation column

Yan, Xiang-Ping; Yao, Yi; Meng, Siqi; Zhao, Shengchuan; Wang, Lijun; Zhang, Haijun; Cao, Yijun

doi:10.1016/j.cherd.2021.07.024

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…CT technology could reconstruct images fast, but there was noise and data corruption . In addition, PIV technology was widely used in the field of multiphase flow. − Scala et al used both the PIV technique and image method to obtain the bubble velocity and diameter. They found that the maximum deviation between the two methods was less than 2%.…”

Section: Introductionmentioning

confidence: 99%

Bubble Morphology Analysis and Pressure Drop of Gas–Liquid Two-Phase Flow inside a Quarto Static Mixer

Yang

Meng

et al. 2022

Ind. Eng. Chem. Res.

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The upward two-phase flow in vertical static mixers is beneficial for dispersion mixing. The bubble size distribution, aspect ratio, and angle distribution of the dispersed phase at various superficial liquid/gas velocities in an industrial Quarto static mixer (QSM) are experimentally studied. The dispersion performance of the QSM is assessed by Sauter mean diameter (d 32), and the empirical correlation of axial d 32 distribution is proposed. The gas–liquid pressure drop in the QSM is measured under U L = 0–0.071 and U G = 0–0.042 m/s, and two new dimensionless empirical correlations are proposed. Based on pressure fluctuation signal time series, the standard deviation, kurtosis, and skewness are analyzed, and the inlet and outlet critical velocities of flow pattern transition from pseudo-homogeneous to heterogeneous in the QSM are identified. Finally, the effect of U G on the dominant frequency and power spectral density function is quantitatively analyzed at the inlet and outlet sections.

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Section: Introductionmentioning

confidence: 99%

Bubble Morphology Analysis and Pressure Drop of Gas–Liquid Two-Phase Flow inside a Quarto Static Mixer

Yang

Meng

et al. 2022

Ind. Eng. Chem. Res.

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“…Then, they were recycled into the FCSMC by the subsequently generated bubbles, thus achieving the efficient separation of fine oil droplets. The detailed flow pattern is available in the literature. − …”

Section: Methodsmentioning

confidence: 99%

Computer-Aided Bubble Size Control for a Swirling-Flow Bubble Generator

Chen

Song

2023

ACS Sustainable Chem. Eng.

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Flotation has garnered increasing attention as an indispensable technology for oily wastewater treatment for sustainable and green development. Bubbles are an essential element during the flotation process. Hence, it is important to examine bubble size control in a bubble generator employed in a flotation deoiling system. Herein, a swirling-flow bubble generator was studied via experiments, simulation, and machine learning methods. As the liquid Reynolds number increased from 16,047 to 32,095, the Sauter mean diameter decreased by 27.3%. Compared to the other open-hole schemes, the spiral-bottom open scheme was advantageous in reducing the bubble size, while decreasing the number of open holes reduced the bubble size further. When the surface tension changed from 0.06 to 0.03 N/m, D 32 decreased by 27.1%. Decreasing the height diameter ratio and increasing the angle between adjacent holes helped generate more smaller bubbles. However, for a given perforation velocity, the bubble size was insensitive to the size of the open holes. The relationship between D 32 and the involved variables was determined accurately by a support vector machine. Finally, a swirling-flow bubble generator with suitable specifications was installed in the flotation deoiling system to achieve an acceptable deoiling performance.

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“…Peng et al 7 used anisotropic droplets generated by negative pressure swirl to mix with air to enhance the flow effect of the flow field and promote dust settlement. In addition, Yan et al 8 and Chen et al 9 studied particles and the mixing characteristics of two-phase flow, respectively. In a word, these studies indicated that the flow field migration has an important influence on the distribution characteristics of fluids.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation Investigation on the Flow Field Distribution Pattern under Different Operating Environment Pressures in a Jet Impingement-Negative Pressure Reactor

Dong,

Qiu,

Chai

2023

ACS Omega

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A jet impingement-negative pressure deamination reactor (JI-NPDR) has excellent ammonia removal efficiency. The CFD numerical simulation method based on the Euler−Euler model and the realizable k−ε turbulence model was used to investigate the effect of different negative pressures at the reactor top outlet on the distribution pattern of pressure, velocity, turbulent kinetic energy, and vortex. The results indicate that the overall water flow distribution in the reactor increases in axial cohesion with the increase in negative pressure. The scattered small eddies gradually connect to a large eddy current as a whole, and the small eddies generated in the jet area also become regular and flat with the increase of negative pressures. These findings can provide detailed information for the study of flow patterns in a jet impingement-negative pressure reactor.

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Comprehensive particle image velocimetry measurement and numerical model validations on the gas–liquid flow field in a lab-scale cyclonic flotation column

Cited by 13 publications

References 17 publications

Bubble Morphology Analysis and Pressure Drop of Gas–Liquid Two-Phase Flow inside a Quarto Static Mixer

Bubble Morphology Analysis and Pressure Drop of Gas–Liquid Two-Phase Flow inside a Quarto Static Mixer

Computer-Aided Bubble Size Control for a Swirling-Flow Bubble Generator

CFD Simulation Investigation on the Flow Field Distribution Pattern under Different Operating Environment Pressures in a Jet Impingement-Negative Pressure Reactor

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