Numerical study on characteristics of particle deposition efficiency on different walls of 90° square bend

Guo, Jiwei; Chen, Zhanxiu; Shen, Boxiong; Wang, Jin; Yang, Li

doi:10.1016/j.powtec.2020.01.059

Cited by 25 publications

(15 citation statements)

References 29 publications

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“…The dimensionless wall distance y + was used in this research to evaluate the mesh resolution requirements for each method, which is defined by equation (6): 13,35 where Δ y is the distance between the wall surface and the first cell centroid and τ w is the wall shear stress, Pa. The dimensionless wall distance is controlled to be close to 1 to meet the refinement to the wall-adjacent mesh size.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…The dimensionless wall distance y + was used in this research to evaluate the mesh resolution requirements for each method, which is defined by equation ( 6): 13,35…”

Section: Near-wall Area Treatmentmentioning

confidence: 99%

“…Their results showed that wall roughness could reduce the ‘particle free zone’ and smoothed the particle number density distribution by changing the particle bounce behaviour. Guo et al 13 investigated the gas-solid two-phase flow process in a 90° bend. Their results showed that with the increase of the curvature ratio, the secondary flow in the bend would become smoother, and the deposition efficiency of particles on the inner wall of the duct would decrease with the increase in the curvature ratio.…”

Section: Introductionmentioning

confidence: 99%

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The effects of imposed swirling flow on the transport and deposition of particulate pollutants in the 90° industrial duct bends: An Eulerian-Lagrangian approach

Han,

Diao,

Zhuang

et al. 2023

Indoor and Built Environment

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Duct bend is one of the important parts of ventilation and dust removal systems, and particles deposited in curved ducts can reduce system efficiency or cause erosion on the bend wall. To investigate whether particle deposition is affected by imposed swirl on fluid flow, this article combines the RSM turbulence model and the Discrete Phase Model (DPM) to predict the deposition efficiency of particles in the bend under high Reynolds number conditions. The results show that the imposed swirl flow modifies the secondary flow initially dominated by the pressure gradient caused by the curvature effect. With the gradual increase of the swirl number ( S n), the deposition efficiency of the particles gradually decreased. However, when the swirl number is low ( S n ≤ 0.17), particles with smaller Stokes numbers are more susceptible to the intensity of turbulence. The higher the turbulence intensity near the wall, the easier it is for low inertia particles ( St ≤ 0.456) to deposit. The higher swirl intensity dominates the centrifugal force, reduces the turbulent intensity in the central region of the duct, improves the stability of the airflow and makes it easier for particles with larger inertia ( St ≥ 0.811) to pass through the bend.

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Section: Simulation Methodsmentioning

confidence: 99%

“…The dimensionless wall distance y + was used in this research to evaluate the mesh resolution requirements for each method, which is defined by equation ( 6): 13,35…”

Section: Near-wall Area Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of imposed swirling flow on the transport and deposition of particulate pollutants in the 90° industrial duct bends: An Eulerian-Lagrangian approach

Han,

Diao,

Zhuang

et al. 2023

Indoor and Built Environment

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“…These RANS turbulence models accurately estimated the particle deposition parameters in ventilation ducts. Previously, Sun et al [ 28 ], Banakermani et al [ 29 ], and Guo et al [ 30 ] examined the particle deposition efficiency of a 90° bend pipe using the RNG k-ε turbulence model. The RNG k-ε model also has a lower computational cost than the RSM model.…”

Section: Mathematical Modelmentioning

confidence: 99%

Particle deposition and fluid flow characteristics in turbulent corrugated pipe flow using Eulerian-Lagrangian approach

Sakib¹,

Shuvo²,

Rahman³

et al. 2023

Heliyon

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“…Particle deposition in pipe bends have been studied extensively and for laminar flows some analytical solutions have been revealed, but under many assumptions that include an idealized flow. This includes Wang (1975, 1981) which provided analytical solutions to the motion (of Mori and Nakayama (1967)) and inertial deposition of particles in a bend, while Davies (1973) Previous studies for deposition in a 90-deg pipe bends Li et al (2013); Guo et al (2020); Inthavong (2019); Breuer et al (2006) used varying upstream particle positions where in real applications, heavy particles are influenced by sedimentation and the longer upstream distances will alter the particle positions as they enter the pipe bend section. This study aims to provide a technique to omit the upstream location by solving the sedimentation problem and comparing the solution with CFD predicted results.…”

Section: Introductionmentioning

confidence: 99%

Sedimentation effects on particle position and inertial deposition in 90° circular bends

Vahaji,

Nguyen,

Shang

et al. 2021

Preprint

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Laminar fluid-particle flows in bend geometries are present in many industrial, pharmaceutical, and biomedical applications. Particle deposition has been studied extensively; however, little attention has been paid to the effect of particle sedimentation on particle position and deposition in different pipe geometry combinations. This study presented a comprehensive analysis of sedimentation effects on particle flow behaviour in 90 • circular pipe bends of micron particles in laminar pipe flows. Pipe geometry combinations consisted of eight pipe diameters, nine bend radii, and 30 particle diameters in a range of 1 to 100 µm. The results demonstrated the locations of particles that sedimented to the bottom half of the straight pipe section, and the particle positions upstream from the pipe bend entrance, which was no longer in a fully developed profile. These new locations represent the effects of gravity, pulling the particles down. While obtaining these positions can be found through CFD analysis, we proposed an analytical solution to predict the particle trajectory from different release locations that would help to identify the initial particle distribution at locations upstream to the bend, to obviate the need for long upstream straight pipe sections in the CFD analysis.

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Numerical study on characteristics of particle deposition efficiency on different walls of 90° square bend

Cited by 25 publications

References 29 publications

The effects of imposed swirling flow on the transport and deposition of particulate pollutants in the 90° industrial duct bends: An Eulerian-Lagrangian approach

The effects of imposed swirling flow on the transport and deposition of particulate pollutants in the 90° industrial duct bends: An Eulerian-Lagrangian approach

Particle deposition and fluid flow characteristics in turbulent corrugated pipe flow using Eulerian-Lagrangian approach

Sedimentation effects on particle position and inertial deposition in 90° circular bends

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