Large eddy simulation of the two-phase flow pattern and bubble formation process of a flow mixing nozzle under a gas–liquid mode

Zhao, Jin; Ning, Zhi; Lv, Ming

doi:10.1088/1873-7005/ab3f7e

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…These data points are calculated using Eqs. ( 10), (14), and (15). The obtained data is then fitted using nonlinear polynomial regression in MATLAB.…”

Section: Determining the L-m Numbermentioning

confidence: 99%

A New Device for Gas-Liquid Flow Measurements Relying on Forced Annular Flow

Yu,

Lv,

Zhong

et al. 2024

FDMP

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A new measurement device, consisting of swirling blades and capsule-shaped throttling elements, is proposed in this study to eliminate typical measurement errors caused by complex flow patterns in gas-liquid flow. The swirling blades are used to transform the complex flow pattern into a forced annular flow. Drawing on the research of existing blockage flow meters and also exploiting the single-phase flow measurement theory, a formula is introduced to measure the phase-separated flow of gas and liquid. The formula requires the pressure ratio, Lockhart-Martinelli number (L-M number), and the gas phase Froude number. The unknown parameters appearing in the formula are fitted through numerical simulation using computational fluid dynamics (CFD), which involves a comprehensive analysis of the flow field inside the device from multiple perspectives, and takes into account the influence of pressure fluctuations. Finally, the measurement model is validated through an experimental error analysis. The results demonstrate that the measurement error can be maintained within ±8% for various flow patterns, including stratified flow, bubble flow, and wave flow. KEYWORDS Gas-liquid flow measurement; blocking flowmeter; measurement model; pressure fluctuations; numerical simulation; experimental control Nomenclature Fr g Froude number Pr Pressure difference ratio ρ Fluid density (kg/m 3 ) β Equivalent diameter ratio This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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“…These data points are calculated using Eqs. ( 10), (14), and (15). The obtained data is then fitted using nonlinear polynomial regression in MATLAB.…”

Section: Determining the L-m Numbermentioning

confidence: 99%

A New Device for Gas-Liquid Flow Measurements Relying on Forced Annular Flow

Yu,

Lv,

Zhong

et al. 2024

FDMP

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“…e magnetic fluid is sealed inside the ball. e twophase field method is used to track the liquid level change of magnetic fluid [29][30][31], and the governing equations can be written as…”

Section: Multiphysical Field Coupling Analysismentioning

confidence: 99%

Numerical Simulation Analysis and Experimental Research on Damping Performance of a Novel Magnetic Fluid Damper

Yang

Wei

et al. 2021

Advances in Materials Science and Engineering

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Considering the low-frequency and large-amplitude vibration characteristics of the high-rise structure, a tuned magnetic fluid rolling-ball damper is proposed to suppress the vibration of the structure. By adjusting the external magnetic field to control the natural rolling frequency of the ball, the purpose of tuning vibration reduction is achieved. Firstly, the working principle of the damper is theoretically analysed, a three-dimensional (3D) magnetic-fluid-solid multiphysical field coupling mathematical model of the damper is established and the governing equations of multiphysical field coupling are derived. Secondly, the magnetic field distribution and operating characteristics of the damper are simulated and analysed. Finally, the effectiveness of the model is verified by experiments, and the damping performance of the damper with two kinds of magnetic fluid is tested and compared. The results show that the magnetic-fluid-solid multiphysical field coupling model can accurately simulate the working characteristics of the damper. The maximum damping force of the damper is about 12% of the elastic force of the structure, which can increase the damping ratio of the structure by about two times, effectively reduce the vibration response time, and suppress the vibration of the high-rise structure.

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“…Dapelo et al [19] shows that, under the condition of gas-liquid mixing, the main factors to change the flow pattern of the flow mixing nozzle are the inertia force of the two phases and the density difference between the two phases. Jin et al [20] combined numerical simulation and PIV test technology, and Processes 2022, 10, 593 2 of 13 finally concluded that in the process of gas-liquid mixed flow, the movement of fluid is driven by the momentum transfer from bubble to liquid. The study shows that the flow pattern of annular jet will affect the degree of sealing of the gas and water mixing zone in the nozzles, and the degree of closure will have a significant impact on the air suction performance and the formation of the foam system [21].…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Gas–Containing Characteristics of Annulus Submerged Jets on Sealing Degree of Mixing Zone

2022

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The introduction of air into a submerged annular jet will result in dispersion of the jet, which will affect the degree of enclosure of the gas–water mixing zone in the annular jet nozzle, and then have a significant impact on air suction and the formation of the foam system in the floatation process. A numerical simulation method is used to analyze the characteristics of the distribution of the axial flow velocity of annular jets, gas–phase volume, and turbulence intensity in the gas–water mixing zone in the nozzle with different air–liquid ratios, and thereby reveal the mechanism whereby gas–containing in annular jets affects the degree of enclosure of the gas–water mixing zone. The results show that as the air–liquid ratio increases, the degree of air–liquid mixing will increase and the radial flow velocity will decrease gradually, resulting in the effective enclosure of the gas–water mixing zone. Meanwhile, the dissipation of jet energy, the range of turbulent flow and the vorticity intensity will increase, but the turbulence intensity will decrease. When the gas–water mixing zone is fully enclosed, as gas–containing continues to increase, the degree of dispersion of the annular jet will further increase. Consequently, the area of the gas–water mixing zone with bounced–back water will become larger, resulting in a higher axial flow velocity, larger local turbulence intensity and larger vorticity intensity. This will lead to the dissipation of jet energy, which is not favorable for air suction.

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Large eddy simulation of the two-phase flow pattern and bubble formation process of a flow mixing nozzle under a gas–liquid mode

Cited by 6 publications

References 15 publications

A New Device for Gas-Liquid Flow Measurements Relying on Forced Annular Flow

A New Device for Gas-Liquid Flow Measurements Relying on Forced Annular Flow

Numerical Simulation Analysis and Experimental Research on Damping Performance of a Novel Magnetic Fluid Damper

Influence Mechanism of Gas–Containing Characteristics of Annulus Submerged Jets on Sealing Degree of Mixing Zone

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