Investigation on particle slug flow using large eddy simulation combined a particle kinetic energy model

Liu, Yang; Liu, Jiatong; Liu, Xue; Li, Guohui; Zhou, Lixing

doi:10.1016/j.cej.2024.153112

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.153112

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Investigation on particle slug flow using large eddy simulation combined a particle kinetic energy model

Yang Liu,

Jiatong Liu,

Xue Liu

et al.

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2024

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Cited by 3 publications

References 62 publications

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A New Bubble Image Model Based on the Recognition of Bubble Flow

Li,

Liu,

Liu

2024

Chem Eng & Technol

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In this study, a new ellipse‐fitting algorithm is proposed to achieve the reconstruction of bubble shapes in bubbly flow captured by a high‐speed camera in the gas–liquid two‐phase column reactor. Bubble flow patterns and geometric parameters in the experimental images are recognized and identified successfully, represented by means of the topological parameters. Three logical steps are carried out in detail. First, the area threshold and the circularity factors are established to identify the bubbles whether belonging to a single bubble or not. The overlapping bubbles in images can be separated from single bubbles based on a watershed segmentation algorithm. Second, a single bubble image and an overlapping bubble image are combined into one image. After that, statistical analysis for the size distributions and ellipse area bubbles is performed for further analysis and discussion. The advantage of this algorithm is that it can make use of a set of major and minor axes of an ellipse to capture the ellipse parameters more effectively. Simulation results are well agreed with experimental measurements. Moreover, it can be used to detect many ellipse‐like bubbles that are dispersed in high‐speed camera images, indicating that it is a better strategy for the recognition and identification of bubbly turbulent flow accurately.

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A New Bubble Image Model Based on the Recognition of Bubble Flow

Li,

Liu,

Liu

2024

Chem Eng & Technol

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A Euler-Euler hydrodynamic modelling and simulation of dense particle flow in a small-scale fluidized bed

Yan,

Liu,

Liu

et al. 2024

Advanced Powder Technology

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Modeling Investigation on Gas Backflow Performances in Screw Vacuum Pump

Zhang,

Liu,

Zhang

et al. 2024

Processes

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Rotor structure has a great influence on the gas backflow in a screw vacuum pump. The characteristics of the gas main flow along the spiral groove of the screw rotor and the gas reverse flow along the tooth-shaped, tooth side, radial, and circumferential clearances are investigated. A new mathematical model of the pumping flow and backflow involved in a flow balance model is proposed to investigate the actions of the shearing force and pressure difference force. The calculated backflow is verified by comparing the experimental measured results. The relationships of the structural parameters of the screw rotor are established. The effects of the rotor parameters, such as pitch, diameter, and compression ratio, on backflow are revealed. The results show that the rotor diameter and compression ratio remain constant and that the influence of pitch on the backflow is slightly weak, with backflow variations of less than 3%, whereas the pitch, rotor length, and compression ratio are constant and the rotor addendum diameter is directly proportional to the backflow. The addendum diameter of rotor #4 is the largest, and its backflow is about 1.5 times larger than that of rotor #1. When the rotor radial sizes and the pitch of the suction end are constant, the compression ratio is inversely proportional to the backflow in the low-pressure region and proportional to the backflow in the high-pressure regions. Therefore, for a vacuum pump operating in low-pressure areas, the use of the compression ratio of 2.2 or higher is favorable for the reduction in backflow.

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Investigation on particle slug flow using large eddy simulation combined a particle kinetic energy model

Cited by 3 publications

References 62 publications

A New Bubble Image Model Based on the Recognition of Bubble Flow

A New Bubble Image Model Based on the Recognition of Bubble Flow

A Euler-Euler hydrodynamic modelling and simulation of dense particle flow in a small-scale fluidized bed

Modeling Investigation on Gas Backflow Performances in Screw Vacuum Pump

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