Large-Eddy Simulation of Two-Phase Flow in Air-Sparged Hydrocyclone

Bukhari, Mustafa; Fayed, Hassan E.; Ragab, Saad A.

doi:10.2514/6.2021-0636

Cited by 2 publications

(2 citation statements)

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“…It is important to validate the two-fluid (Euler-Euler) model used in the present paper by comparing the results with VOF model, the later model is commonly used to resolve air core-water interface in hydrocyclones of the present type. However, the two-fluid model is the natural choice for air-sparged hydrocyclones where there are a huge number of bubbles and resolving the gas-liquid interfaces is not computationally feasible by VOF, [26].…”

Section: Comparison Of Volume-of-fluid and Two-fluid Modelsmentioning

confidence: 99%

“…This approach of multiphase flows is more expensive than mixture model, but it is more accurate for multiphase problems that have large spatial variations in void fractions of dispersed phases. Moreover, the two-fluid model is the natural choice for air-sparged hydrocyclones ( [24][25][26]) where there are a huge number of bubbles in addition to an air core or froth layer and resolving the gas-liquid interfaces is not computationally feasible by VOF.…”

Section: Introductionmentioning

confidence: 99%

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Large-Eddy Simulation of a Hydrocyclone with an Air Core Using Two-Fluid and Volume-of-Fluid Models

Fayed¹,

Bukhari

Ragab

2021

Fluids

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Large-eddy simulations have been conducted for two-phase flow (water and air) in a hydrocyclone using Two-Fluid (Euler–Euler) and Volume-of-Fluid (VOF) models. Subgrid stresses are modeled using a dynamic eddy–viscosity model, and results are compared to those using the Smagorinsky model. The effects of grid resolutions on the mean flow and turbulence statistics have been thoroughly investigated. Five block-structured grids of 0.72, 1.47, 2.4, 3.81, and 7.38 million elements have been used for the simulations of Hsieh’s 75 mm hydrocyclone Mean velocity profiles and normal Reynolds stresses have been compared with experimental data. Results of the two-fluid model are in good agreement with those of the VOF model. A fine mesh in the axial and radial directions is necessary for capturing the turbulent vortical structure. Turbulence structures in the hydrocyclone are dominated by helical vortices around the air core. Energy spectra are analyzed at different points in the hydrocyclone, and regions of low turbulent kinetic energy are identified and attributed to stabilizing effects of the swirling velocity component.

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Section: Comparison Of Volume-of-fluid and Two-fluid Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%