Validation and simulation of cavitation flow in a centrifugal pump by filter-based turbulence model

Cao, Weidong; Jia, Zhixiang; Zhao, Zhenjiang; Zhou, Lei

doi:10.1080/19942060.2022.2111363

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…The equation is described in detail in other literature and will not be repeated here. 30,31 The main equations include the mass conservation equation…”

Section: Simulation Methodsmentioning

confidence: 99%

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Effects of Particle Diameter and Inlet Flow Rate on Gas–Solid Flow Patterns of Fluidized Bed

et al. 2023

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The complex multiscale characteristics of particle flow are notoriously difficult to predict. In this study, the evolution process of bubbles and the variation of bed height were investigated by conducting high-speed photographic experiments to verify the reliability of numerical simulations. The gas–solid flow characteristics of bubbling fluidized beds with different particle diameters and inlet flow rates were systematically investigated by coupling computational fluid dynamics (CFD) and discrete element method (DEM). The results show that the fluidization in the fluidized bed will change from bubbling fluidization to turbulent fluidization and finally to slugging fluidization, and the conversion process is related to the particle diameter and inlet flow rate. The characteristic peak is positively correlated with the inlet flow rate, but the frequency corresponding to the characteristic peak is constant. The time required for the Lacey mixing index (LMI) to reach 0.75 decreases with increasing inlet flow rate; at the same diameter, the inlet flow rate is positively correlated with the peak of the average transient velocity; and as the diameter increases, the distribution of the average transient velocity curve changes from “M” to linear. The results of the study can provide theoretical guidance for particle flow characteristics in biomass fluidized beds.

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“…The equation is described in detail in other literature and will not be repeated here. 30,31 The main equations include the mass conservation equation…”

Section: Simulation Methodsmentioning

confidence: 99%

“…The gas phase flow field is solved by the locally volume-averaged Navier–Stokes equations. The equation is described in detail in other literature and will not be repeated here. , …”

Section: Simulation Methodsmentioning

confidence: 99%

Effects of Particle Diameter and Inlet Flow Rate on Gas–Solid Flow Patterns of Fluidized Bed

et al. 2023

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Stabilize cloud cavitation with an obstacle near hydrofoil's trailing edge and conduct local entropy production analysis

Wang,

Liu,

et al. 2024

Physics of Fluids

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Cloud cavitation always causes severe damage to the efficiency and stability of the hydraulic machinery, resulting in extra energy losses in the system. We have observed an effective and simple way to prevent cloud cavitation formation by placing an obstacle near the hydrofoil's trailing edge. Cavitating flows around four different types of hydrofoils were simulated using the stress-blended eddy simulation turbulence model: the National Advisory Committee for Aeronautics (NACA) 66 hydrofoil and the NACA 66 hydrofoil with a 1 ×1 mm2 obstacle at 0.3c, 0.5c, or 0.7c. Sheet cavitation is the predominant mode of cavity flow when the obstruction is positioned at 0.7c. To find out why the cloud cavitation growth can be stopped when the obstruction is positioned at 0.7c, the velocity field, vorticity in the Z direction, and vortex structure of the Q-criterion were computed. To study the energy loss of the cavity flow and comprehend how obstacles affect it, the local entropy production rate was computed. It was discovered that the vorticity downstream of the obstacle, positioned at 0.7c, is restructured, which helps manage the flow separation upstream of the obstacle. Consequently, the hydrofoil's suction surface vorticity nearly rotates in the same direction as the obstacle at 0.7c, and the direction of Vx upstream of the obstacle is in the positive direction of the X axis, indicating that the reentrant flow has been controlled upstream of the 0.7c obstacle. Furthermore, cavitation shedding and the entropy production rate are strongly correlated, and regulating cloud cavitation growth is advantageous for energy conservation.

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Assessment of cavitation noise in a centrifugal pump using acoustic finite element method and spherical cavity radiation theory

Ali

Liao

et al. 2023

Engineering Applications of Computational Fluid Mechanics

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Validation and simulation of cavitation flow in a centrifugal pump by filter-based turbulence model

Cited by 4 publications

References 40 publications

Effects of Particle Diameter and Inlet Flow Rate on Gas–Solid Flow Patterns of Fluidized Bed

Effects of Particle Diameter and Inlet Flow Rate on Gas–Solid Flow Patterns of Fluidized Bed

Stabilize cloud cavitation with an obstacle near hydrofoil's trailing edge and conduct local entropy production analysis

Assessment of cavitation noise in a centrifugal pump using acoustic finite element method and spherical cavity radiation theory

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