Estimation of turbulent dissipation rates and its implications for the particle-bubble interactions in flotation

Zhao, Lina; Liu, D.; Lin, Jichao; Chen, Liguo; Chen, Songying; Wang, Guichao

doi:10.1016/j.mineng.2023.108230

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…At present, the commonly used model for the numerical simulation of flow patterns in the forebays of pumping stations is the k − ε [27] model. Turbulent viscosity is determined by the turbulent kinetic energy [28] of k and the turbulent dissipation rate [29] ε calculated using the transport equation. Perform a 1:1 restoration model based on the actual size of the circular forebay.…”

Section: Reynolds Equation Grid Division and Boundary Conditions 231 ...mentioning

confidence: 99%

Analyzing Water and Sediment Flow Patterns in Circular Forebays of Sediment-Laden Rivers

Wang,

Tai,

Huang

et al. 2023

Sustainability

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In the circular forebay of sediment-laden rivers, adverse flow patterns such as vortices emerge, leading to substantial sediment accumulation along the sidewalls of the diversion channel and in the forebay. This sediment accumulation significantly impacts the operational efficiency of water pumps. To address these challenges, a combination of numerical simulations and engineering experiments was employed to reveal the factors contributing to the development of these patterns. Based on these findings, seven distinct flow rates and operating conditions were introduced to obtain the optimal inlet flow rate and increase the sustainability of engineering use. The findings revealed that the different inlet flow rates exert varying influences on the flow patterns in the circular forebay, leading to changes in sediment levels in both the forebay and diversion channels. Following comprehensive comparison, Scheme 6 was identified as the optimal flow rate scheme. In this scheme, the flow uniformity, deviation angle, ratio of the vortex reduction area parameter, and rate of vortex area reduction in sections z1−3 were markedly enhanced. The effectiveness of this scheme was validated through rigorous numerical simulations and engineering experiments, thereby offering indispensable theoretical insights into the operation of pumping stations in circular forebays.

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Section: Reynolds Equation Grid Division and Boundary Conditions 231 ...mentioning

confidence: 99%

Analyzing Water and Sediment Flow Patterns in Circular Forebays of Sediment-Laden Rivers

Wang,

Tai,

Huang

et al. 2023

Sustainability

View full text Add to dashboard Cite

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Research of Bubble Breakup and Influencing Factors in Flotation Machine

Zhou,

Lin,

Yuan

et al. 2024

IJMPEM

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As the core factor of flotation, bubbles have an important effect on flotation. The rotor speed, initial gas parameters and impeller structure of the flotation machine will affect the formation and movement of bubbles. It is very important to study the influence mechanism of operating parameters of flotation machine on the bubble breakup process for flotation machine design and structure optimization. This paper takes KYF-0.2m<sup>3</sup> flotation machine as the research object, establishes a single bubble analysis model, adopts the VOF (Volume of Fluid) method to analyze the influence of different initial positions of bubbles on the bubble breakup behavior, and studies the influence of impeller speed and initial position of bubbles on the bubble breakup. Result show that the breakup of bubbles mainly occurs near the stator region. With the increase of rotational speed of the impeller, the centrifugal force and the disturbance of the convection field will become greater, the time of the bubble breakup become shorter, more bubbles breakup and generate more smaller ones. With the bubble position is closer to the rotating axis of the impeller, the impact of reflow becomes stronger and the bubble breakup effect will be better, and if the bubble initial position closer to the impeller cover, the influence of impeller on the bubbles become greater and the distribution of bubbles will be more uniform.

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Estimation of turbulent dissipation rates and its implications for the particle-bubble interactions in flotation

Cited by 2 publications

References 36 publications

Analyzing Water and Sediment Flow Patterns in Circular Forebays of Sediment-Laden Rivers

Analyzing Water and Sediment Flow Patterns in Circular Forebays of Sediment-Laden Rivers

Research of Bubble Breakup and Influencing Factors in Flotation Machine

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